find sum of first n natural number hence find S150
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Step-by-step explanation:
a= 1 ,d= 1, n=?
Sn= n/2 [2a + (n -1)d]
= n/2 [2×1 + (n-1)×1]
= n/2[ 2 + n-1]
=n/2 [1+ n] (i)
substituting 150 in place of n in eq (i)
150/2 ( 150 +1 )
= 75 × 151
= 11325
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