Problem Solving (PS) | Re: Beth began a 16-day exercise program by doing 5 sit-ups on the first

Given an a.p where a= 5
n = 16 and d= 1
We are asked sum of A.P
which is
S= \(\frac{n}{2}(2a+(n-1)d)\)
= \(\frac{16}{2}(10+15*1)\)
= 200
hence answer B

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