4.Which of the following is a Pythagorean triplet?
2n, (n2 – 1) and (n2 + 1)
(n – 1), (n2 – 1) and (n2 + 1)
(n + 1), (n2 – 1) and (n2 + 1)
(n2 - 1) and (n2 + 1)
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Three positive integers a, b and c are called Pythagorean triplets, if c²=a²+b²
once we get the Pythagorean triplets (a, b, c) , we may divide or multiply all the three numbers by the same constant to get new triplets
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