find sum of series 1*32 , 2*52 , 3*72 , ......................20 terms
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here is your answer buddy:
>>> sn = n/2 {2a + (n-1)d }
sn = 10 {32×2 + 19×72 }
sn = 10 (1432)
sn= 14320
hope it helps you!!!
>>> sn = n/2 {2a + (n-1)d }
sn = 10 {32×2 + 19×72 }
sn = 10 (1432)
sn= 14320
hope it helps you!!!
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