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P(n) = n(n^2 – 1). Which of the following does not divide P(k+1)?(a) k(b) k + 2(c) k + 3(d) k + 1This question was posed to me in class test.My question is from The Principle of Mathematical Induction in division Principle of Mathematical Induction of Mathematics – Class 11

Answer»

Correct answer is (C) K + 3

Easy explanation: P(N) = n(n^2 – 1)

P(k + 1) = (k + 1) ((k + 1)^2 – 1)

P(k + 1) = (k + 1) (k^2 + 1 + 2k – 1)

P(k + 1) = (k + 1) (k^2 + 2k)

P(k + 1) = (k + 1) k (k + 2)

Therefore, k, (k + 1), (k – 1) divide P(k + 1).



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