If \( n \) is a natural number, then \( 9^{2 n}-4^{2 n} \) is always divisible by (a) 5 (b) 13 (...

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If \( n \) is a natural number, then \( 9^{2 n}-4^{2 n} \) is always divisible by
(a) 5
(b) 13
(c) Both (a) and (b)
(d) Neither (a) nor (b)
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