A) 17
B) 11
C) 8
D) 7
Correct Answer: C
Solution :
\[{{3}^{15}}\text{ +}{{3}^{16}}+{{3}^{17}}+{{3}^{18}}\] \[=\,\,\,{{3}^{15}}(1+{{3}^{1}}+{{3}^{2}}+{{3}^{3}})\] \[=\,\,\,\,{{3}^{15}}(1+3+9+27)={{3}^{15}}\times 40\] So, number is divisible by 8.You need to login to perform this action.
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