If \( n \) is a positive integer, show that P (i) \( 9^{n}+7 \) is ...

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If \( n \) is a positive integer, show that
P
(i) \( 9^{n}+7 \) is divisible by 8 .
W
(ii) \( 3^{2 n+1}+2^{n+2} \) is divisible by 7
(iii) \( 6^{2 n}-35 n-1 \) is divisible by 1225 .
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