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3+6+9+12+15+18+21+24
18+27+18+54
45+72
117
18+27+18+54
45+72
117
ArindamBiswas:
wow what a wrong answer!!
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a=3
d=3
S8=8/2{2*3 +(8-1)3}
=4{6 + 7*3}
=4{6+21}
=4*27
=108
d=3
S8=8/2{2*3 +(8-1)3}
=4{6 + 7*3}
=4{6+21}
=4*27
=108
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