Verification of the formula the sum of first n term of an AP
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1+2+3+.... +n
Here a=1 and the last term l is n
Sn = n(l+n) /2 or Sn=n(n+1)/2
So the sum of first positive integer is given by
Sn
Sn=n(n+1)/2
Or it is give in ncert page no 110
Here a=1 and the last term l is n
Sn = n(l+n) /2 or Sn=n(n+1)/2
So the sum of first positive integer is given by
Sn
Sn=n(n+1)/2
Or it is give in ncert page no 110
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