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\(7^{2 n}+16 n-1(n \in N)\) is divisible by
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Dec 11, 2021
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\(7^{2 n}+16 n-1(n \in N)\) is divisible by
(A) 65
(B) 63
(C) 61
(D) 64
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Ans: (B)
Hint \(:{ }^{7} C_{4} \times 3 !\left(\frac{1}{2 !}-\frac{1}{3 !}\right)={ }^{7} C_{3} \times 2\)
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