If first term is 1 , then find the sum of first 30 terms.
Asked by sunil_0010 | 1st Jul, 2009, 10:19: PM
the sum of first 20 terms of an A.P.
with first term as a and common diff as d is
sum of the next 20 terms
=sum of the first 40 terms -sum of the first 20 terms
acc to qn
solving we get
is it given that first term is1?
then you can find the sum of the first thirty terms using formula for sum of n terms.
Answered by | 1st Jul, 2009, 10:47: PM
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