Prove that 7 divides 2^n+1 + 3^2n-1 whenever n is a positive integer. on promotion

Step-by-step explanation:

To prove 7 divides

let

for n>1

For n=1

to show that

 for some interger x

this equation will also be valid for

rearranging

using induction hyposthesis

thus

hence 7 divides

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step-by-step explanation:

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