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Question

Write a Pythagorean triplet whose smallest member is 8.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
8, 15, 17

Pythagorean Triplet Finding

A Pythagorean triplet includes three positive integers $a, b, c$ such that $a^2 + b^2 = c^2$. We need to identify a triplet where 8 is the smallest integer.

Evaluate Triplets

We test each option against the Pythagorean theorem ($a^2 + b^2 = c^2$) and the smallest member condition.

  • Option 1:
    8, 15, 19

    Test: $8^2 + 15^2 = 64 + 225 = 289$. $19^2 = 361$. Since $289 \neq 361$, it's not a Pythagorean triplet.

  • Option 2:
    8, 10, 12

    Test: $8^2 + 10^2 = 64 + 100 = 164$. $12^2 = 144$. Since $164 \neq 144$, it's not a Pythagorean triplet.

  • Option 3:
    8, 15, 17

    Test: $8^2 + 15^2 = 64 + 225 = 289$. $17^2 = 289$. Since $289 = 289$, this is a Pythagorean triplet. The smallest member is indeed 8.

  • Option 4:
    8, 18, 28

    Test: $8^2 + 18^2 = 64 + 324 = 388$. $28^2 = 784$. Since $388 \neq 784$, it's not a Pythagorean triplet.

Result

The triplet (8, 15, 17) correctly satisfies the conditions of being a Pythagorean triplet with 8 as its smallest member.

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