Answers

2015-10-23T17:45:15+05:30
Consider below geometric sum :
1+49+49^2+\cdots+49^{14}=\dfrac{49^{15}-1}{49-1}
\implies~(49-1)(1+49+49^2+\cdots+49^{14})=49^{15}-1

Therefore, 49-1=48 divides 49^{15}-1
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