Q5 of 50 Page 6

Which of the numbers for which you cannot decide whether they are squares.

All the natural numbers whose unit digit is 0, 1, 4, 5, 6 or 9 can not be said surely if they are square numbers or not

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Express 121 as the sum of 11 odd numbers

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Find square of 86.

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Observe the following pattern and find the missing digits

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Write a Pythagorean triplet whose one number is 18.