Find the sum
23+25+27+29+...................+71
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given Is an A.P with common difference = 2
and a = 23
let n be total no. of terms
23+(n-1)*2 = 71
(n-1)*2 = 48
(n-1) = 24
n= 25
thus sum of a.p = n/2 (a+l)
a= first term = 23
l = last term = 71
n = 25
sum = 25/2 (23+71)
sum = 25*47= 1175
and a = 23
let n be total no. of terms
23+(n-1)*2 = 71
(n-1)*2 = 48
(n-1) = 24
n= 25
thus sum of a.p = n/2 (a+l)
a= first term = 23
l = last term = 71
n = 25
sum = 25/2 (23+71)
sum = 25*47= 1175
abhiadm001:
Bt.... Adding mistake bro...... n=25, plese check
hmm thanks now its alright
i did a mistake in hurry
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