the ages of the boys in agroup are in AP
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a= 12
d= 3/12 = 1/4
Sn=375
375= 12 + (n-1) 1/4
363= (n-1) 1/4
363 x 4 = n-1
1452=n-1
1453=n
d= 3/12 = 1/4
Sn=375
375= 12 + (n-1) 1/4
363= (n-1) 1/4
363 x 4 = n-1
1452=n-1
1453=n
vaaaaniiii:
Actually the formula for Sn is n/2(2a+(n-1)d)
i'm terribly sorry about that , did that by mistake
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