Find the sum of the terms of the finite AP : 1, 3, 5, 7,…,199
A
10000
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B
12000
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C
13333
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D
20000
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Solution
The correct option is A 10000 Given, a=1,d=2 an=l=199 a+(n−1)d=199 1+(n−1)2=199 ⇒1+2n−2=199 ⇒2n=200 n=100 Sum of n terms: Sn=n2(a+l) So, sum of the terms of the given AP=S100=1002(1+199) =10000