true or false  1.) If a │b then a │b^n for n ϵ N 2.) n^4 + 4 is composite for all n > 1 3.)If p is prime such that p │a and p │(a^2 + b^2), then p │b

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A:

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A: हमें दी गई समस्या को हल करना है:

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Q: If n is a positive integer, then prove that 2n(2n-1) 2n(2n-1)(2n-2) 2! 3! 1-2n+- + ...

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A: Simplification