For each positive number n, let P(n)be the formula 1 1 (1+;)(1+ (1+– = n + 1. .. (a) Write P(1). Is P(1) true? (b) Write P(k). (c) Write P(k+1). Hence complete the inductive step to prove by mathematical induction that P(n) holds for all positive inters n.

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A: As we know that GM=abhere a=28 and b=112so GM=28×112 =56

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