A) 960
B) 660
C) 1200
D) 1060
Correct Answer: A
Solution :
Ans. First 15 multiple of 8 are 8, 16, 24, ..., 120 So, 8(1, 2, 3, 4, ..., 15) Their sum \[=8\,\left[ \frac{n(n+1)}{2} \right]\] \[=8\,\,\left[ \frac{15(15+1)}{2} \right]=8\times 15\times 8=960\]
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