For \( n \in \mathbb{N}, 7^{4^{n}}-1 \) is divisible....

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For \( n \in \mathbb{N}, 7^{4^{n}}-1 \) is divisible
\( \mathrm{P} \)
(1) \( 2^{2 n+3} \)
(2) \( 2^{n+3} \)
W
(3) \( 2.4^{n+1} \)
(4) \( 2^{2 n} \)


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