Using your Sherlock Holmes IQ Level with 20/20 Eye-Sight to find out the Inverted “15” and “13” in this “51” Repeating Unintelligible Brain Teaser Series

Sep 9, 2025, 23:00 IST

Test your Sherlock Holmes-level IQ and sharp 20/20 vision with this tricky brain teaser! Hidden within a repeating “51” series lies an inverted “15” and “13.” Only 1% with keen observation skills can spot them in just 7 seconds. Can you prove your detective-level focus?

Find out the Inverted “15” and “13” in this “51” Repeating Unintelligible Brain Teaser Series
Find out the Inverted “15” and “13” in this “51” Repeating Unintelligible Brain Teaser Series

A brain teaser is a short, playful puzzle designed to challenge your mind and elicit a smile. It could be a riddle, a tricky question, a visual illusion, or a logic twist that nudges you to think beyond the obvious. Instead of raw memorisation, it asks you to pause, notice patterns, question assumptions, and try alternate paths. 

Sometimes the answer seems to be simple, but in these types of brain teasers, there is a hidden twist behind clever wording or an unexpected angle. Solving these types of tricky puzzles will boost your IQ level, thinking skills and your observation skills.

Solving these types of brain teasers regularly can sharpen focus, boost creativity, and build patience, all while giving your brain a fun, low-pressure workout. 

If you all love these types of brain teasers and optical illusions, do share them with friends to spark conversation, friendly, curious competition, and laughter.

Are you ready for this brain teaser test? Today’s brain teaser is cleverly designed to test your perception and observation skills. The image appears to be a series pattern in the close box format, in which you can easily see the repeating pattern series of “15”.

The challenge is to find out the inverted “15” and “13” among the Repeating Series of “51”, which is an Unintelligible Brain Teaser Series test.

Can you prove you have an IQ level of 143 or higher with 20/20 vision? This “51” repeating series optical illusion can only be solved by 1%, and those who can use their Detective-Attention With Hawk–Eye Vision, and have Sherlock Holmes IQ Level, they may be able to find out the inverted “15” and “13” in this “51” repeating unintelligible series brain teaser within just 7 seconds. Are You?

Must Try: Only 1% with their Matrix-Level Vision Can Find the Hidden Owl in this Savannah Landscape of Optical Illusion

Using your Sherlock Holmes IQ Level with 20/20 Eye-Sight to find out the Inverted “15” and “13” in this “51” Repeating Unintelligible Brain Teaser Series

optical-illusion-within-6-seconds-spot-the-inverted-13-and-15-among-51s-68ac1d74c361a6223699-1200

Source: freejobalert

At first glance, this numerical optical illusion appears to be in a repeating series of “51”. But in this repeating pattern of “51”, there is a hidden inverted “15” and “13” in this numerical optical illusion brain teaser test.

Your challenge? Use your HD-eye vision to locate the inverted “15” and “13” without scrolling away or asking for hints.

So if you think that your IQ is higher than 100% of people, then by using your sharp Hawk-Eye Vision and observation skills and also using your 140+ IQ level, could you find out the inverted “15” and “13” in this “51” repeating unintelligible brain teaser series in 7 seconds?

I think you all have now received a brief overview of the image, and you can now start your brain teaser challenge.

So, almost ready!

Then set the timer on your clock for 7 seconds

Ready… Get… Set… Go…

Yes, observe the image very carefully.

Use your sharp IQ skills.

Hurry up! Time is ending…

3…2…1… Stop! Stop! Time’s Up!

So, how was the challenge? Okay, congratulations to those who could have found the inverted “15” and “13” in this “51” repeating unintelligible brain teaser series in 7 seconds; you all are geniuses, and you all possess Einstein-level 140+ IQ and vigilant-eye vision, and obviously, you are in the 1% of people who can solve this visual brain teaser. 

Okay, now those who were not able to find out the inverted “15” and “13” in this “51” repeating unintelligible brain teaser series in 7 seconds, they also do not worry. 

Do practice these puzzles and brain teasers, and your IQ level, thinking skills, and problem-solving skills will be increased.

Try This: Only 3 out of 100 People Using their Einstein-level IQ can Find the Hidden Cat in this Dense Crowd of Diverse Faces

Solution for this Repeating Unintelligible Brain Teaser Series: Where are the Inverted “15” and “13 hidden in the “51” numerical series?

So, are you excited to know where the inverted “15” and “13” are hidden in the “51” repeating unintelligible brain teaser series?

Okay, first, look carefully at the image. Now move to the 6th row from the bottom and move to the 2nd number from the left side, there is inverted “15”, and now  move to the 4th row from the top and move to the 6th number from the right side, there is inverted “13”. Still not found, look down in the image, it has been circled.

inverted-sol

Source: freejobalert

So, now you all know where the inverted “15” and “13” are hidden in the “51” repeating unintelligible brain teaser series, and by solving this optical illusion challenge, you all have enjoyed it.

By practising these types of puzzles, your IQ will increase, and so will your observation and problem-solving skills.

Try This: If you Possess Sharp Eagle-Eye Vision With 20/20 Eyesight, Then Find Out the Hidden Number in this Geometrical Optical Illusion


Prabhat Mishra
Prabhat Mishra

Content Writer

    Prabhat Mishra is an accomplished content creator with over 2 years of expertise in education, national and international news, and current affairs. A B.Tech graduate with extensive UPSC preparation, he has qualified for the UPPCS 2022 Mains and Bihar 68th Mains, showcasing his deep understanding of competitive exams.

    He has contributed to top platforms like Mentorship IndiaIAS BABA, and IAS SARTHI, delivering engaging articles on trending topics and global affairs. As a content writer for Jagranjosh.com, Prabhat specializes in crafting high-quality, insightful content for the G.K. and Current Affairs section, driving engagement and providing value to a wide audience.

    Reach him at prabhat.mishra@jagrannewmedia.com, and explore his work on Jagranjosh.com for the latest updates and analyses!

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