$$\left( {{2^{71}} + {2^{72}} + {2^{73}} + {2^{74}}} \right)$$ is divided by :
A. 9
B. 10
C. 11
D. 13
Answer: Option B
Solution(By Examveda Team)
$$\eqalign{ & \Leftrightarrow \left( {{2^{71}} + {2^{72}} + {2^{73}} + {2^{74}}} \right)\, \cr & = {2^{71}}\left( {{2^0} + {2^1} + {2^2} + {2^3}} \right)\, \cr & = {2^{71}}(1 + 2 + 4 + 8) \cr & = {2^{71}} \times 15 \cr & = {2^{70}} \times 30 \cr & {\text{It is divisible by 10}} \cr} $$Related Questions on Number System
Three numbers are in ratio 1 : 2 : 3 and HCF is 12. The numbers are:
A. 12, 24, 36
B. 11, 22, 33
C. 12, 24, 32
D. 5, 10, 15
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