the sum s of first n natural number is given by the relation sñ= n(n+1)÷2 find the value of n,if the sum (sn) is 276
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Given that
Sn=276 ......(1)
But Sn =n (n+1)/2 ....... (2)
from equation (1)&(2)
n (n+1)÷2 = 276
n (n+1) =276×2
n^2+n = 552
n^2+n-552 =0
Using S.D.M formula
we get
n =23
Ans
Sn=276 ......(1)
But Sn =n (n+1)/2 ....... (2)
from equation (1)&(2)
n (n+1)÷2 = 276
n (n+1) =276×2
n^2+n = 552
n^2+n-552 =0
Using S.D.M formula
we get
n =23
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