Question

which of the following are pythagorean triplet? how?

Answer 1

Hence option "a" is a pythagorean triplet .

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Answer 2

In a pythagorean triplet the sum of squares of two number is equal to the square of the third number .

Therefore 9, 40, 41 is a pythagorean triplet as
${9}^{2} + {40}^{2} = {41}^{2}$