A) \[\frac{1}{2}\]
B) \[\frac{1}{4}\]
C) \[\frac{1}{3}\]
D) \[\frac{2}{3}\]
Correct Answer: B
Solution :
\[\frac{{{(S)}_{(last\ 2s)}}}{{{(S)}_{7s}}}=\frac{\frac{1}{2}\times 2\times 10}{\frac{1}{2}\times 2\times 10+2\times 10+\frac{1}{2}\times 2\times 10}=\frac{1}{4}\]
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