The value of 3 + 6 + 9 + .... + 60 is equal to
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given
3+6+9+.........60
take common 3
3(1+2+3+4+.......20)
now sum of n term
=n(n+1)/2
so
n=20
3*20(20+1)/2
3*210
630
3+6+9+.........60
take common 3
3(1+2+3+4+.......20)
now sum of n term
=n(n+1)/2
so
n=20
3*20(20+1)/2
3*210
630
alagarsamy:
wromg answer
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