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Verify that 2(7^n) + 3(5^n) - 5 always divides evenly by which number?
A24
B12
C48
D36
Answer & Solution
Correct answer: A. 24
The value is 24 at n = 1 and 168 = 24 x 7 at n = 2, so 24 is the greatest common divisor.
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