Find the sum old number between 1 and 250
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they are asked between so 3,5,7,........249
an=a+(n-1)d
249=3+(n-1)2
249=3+2n-2
248=2n
n=124
Sn =n/2[a+l]
Sn=124/2[3+249]
Sn=62[252]
sn =15624
an=a+(n-1)d
249=3+(n-1)2
249=3+2n-2
248=2n
n=124
Sn =n/2[a+l]
Sn=124/2[3+249]
Sn=62[252]
sn =15624
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