Find the sum of 15 terms of an ap2,7,12
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4
Answer:
455
Step-by-step explanation:
2,7,12,17... is in AP
a=2,
d=5
Sn=n/2[2a+(n-1)d]
S15=15/2[2(2)+(15-1)5]
=15/2[4+70]
=15/2(74)
=15(37)
=455
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