A) \[1:2\]
B) \[2:1\]
C) \[2:3\]
D) \[3:2\]
Correct Answer: A
Solution :
Under conditions, we get\[\frac{10}{2}\left\{ 2a+(10-1)d \right\}=4\left[ \frac{5}{2}\left[ 2a+(5-1)d \right] \right]\] \[\Rightarrow \]\[2a+9d=4a+8d\] or \[\frac{a}{d}=\frac{1}{2}\] Hence\[a:d=1:2\].
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