A) Is divisible by 5
B) Is an odd integer divisible by 5
C) Is an even integer which is not divisible by 5
D) Is an odd integer which is not divisible by 5
Correct Answer: B
Solution :
\[\sum\limits_{n=1}^{20}{({{n}^{3}})}-\sum\limits_{n=1}^{10}{({{n}^{3}})}=\left[ \frac{n(n+1)}{2} \right]_{n=20}^{2}-\left[ \frac{n(n+1)}{2} \right]_{n=10}^{2}\] Þ \[{{s}_{2}}={{\left[ \log \,5/3 \right]}^{2}}\] = 44100 - 3025 = 41075.
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