Please find the sum.
Asked by sunil_0010 | 1st Jul, 2009, 10:32: PM
we see that the first term=a=54
common diff =d=-3
let the sum of n terms is 513
so using the formula we get,
putting the values of a and d,we get a quadraticc equation, on factorising that
so if the number of terms is 18 or 19, we get the sum as zero.
now, for the double answer
since the 18th term
since the common diff is -3,
the next term i.e.the 19th term will be
so whethter you take the sum of 18 terms or 19 terms , it will still be 513
as the 19th term is zero.
Answered by | 2nd Jul, 2009, 09:37: AM
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