This is an arithmetic sequence with a1 = -1.5 and d = 2.
The 20th term is -1.5 + 19*2 = 36.5
The sum of n terms of an arithmetic sequence is n(a1 + an)/2.
Raghini P.
asked • 11/13/18summation of ap -3/2.1/2,5/2......upto 20 terms?
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