4, 9, 25, ?, 121 Answer is not 64. Many failed to complete this series! Can you do it?

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Transcript

00:00Welcome everyone. So yes, a lot of people thought that the answer for this one should be 64.

00:07Because here, if you look closely, all of these are squares, right?

00:11This is 2 square, this is 3 square, this is 5 square.

00:17So next they thought, because here the difference is of 1, here the difference is of 2,

00:21the next difference should have been of 3, which gets you 8 square.

00:25And 8 square's answer is what? 64.

00:27But, if you look closely, the difference between 8 and this is 11 square, right?

00:33So here also difference comes out to be 3.

00:35So that means that this logic will not work, because here technically the difference should have been of 4.

00:44Right? So probably that is not going to work.

00:47So now in this case, how will we do this?

00:50Okay? See, here you need to realize that, see, this one is 11 square.

00:56So these are what prime numbers?

00:592, 3, 5, then 11.

01:01So here the prime number which comes between 5 and 11 is 7.

01:07So 7 square.

01:08So answer for this question mark has to be 49.

01:13I hope this is very, very clear to everyone.

01:16That's it for today.

01:18I will see you in the next video.

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