A) 5
B) 8
C) 10
D) 15
Correct Answer: C
Solution :
Given that first term\[a=10\], last term \[l=50\] and sum \[S=300\] \[\therefore \ \ S=\frac{n}{2}(a+l)\]\[\Rightarrow \]\[300=\frac{n}{2}(10+50)\]\[\Rightarrow \]\[n=10\].
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