Print sum of following series : 2 _ 5 + 10 _ 17 + 26 . . . . . . . . . n terms 101 100 98 95 90
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Answer:
Find the sum of the first 40 terms of the arithmetic sequence
2,5,8,11,14,⋯
First find the 40 th term:
a40=a1+(n−1)d =2+39(3)=119
Then find the sum:
Sn=n(a1+an)2S40=40(2 + 119)2=2420
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