Write the Pythagorean triplet whose one of the numbers is 4.

Given:

We know that for any natural number greater than 1, (2m, m²-1, m² + 1) is a the Pythagorean triplet.

So if one number is 2m then other two number are m²-1 and m² + 1.

i.e. 2m = 4 (given)

⇒ m = 2

Then m²-1 = 2²-1 = 4-1 = 3

And m² + 1 = 2² + 1 = 4 + 1 = 5

Hence, Pythagorean triplet is 3, 4 and 5