The first term of finite AP.is 5, the last term is 45 and the sum is 500. Find the number of terms.
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S=n/2(a+l)
500=n/2 (5+45)
500×2=50n
therfore, n = 500×2/50
= 20....
therefore, there are 20 terms in the AP
500=n/2 (5+45)
500×2=50n
therfore, n = 500×2/50
= 20....
therefore, there are 20 terms in the AP
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