find the sum of all given terms of the AP 5,8,11,14...47
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here there are 15 terms
so here a=5 d=3 n=15
so Sn=n/2[2a+(n-1)d]
=15/2[10+(15-1)3}
=15/2 *[52]
=780/2
=390
so here a=5 d=3 n=15
so Sn=n/2[2a+(n-1)d]
=15/2[10+(15-1)3}
=15/2 *[52]
=780/2
=390
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