find the sum of first 15 terms of AP: 2,5,8,11.....
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Step-by-step explanation:
Sn=n/2.2a+n-1.d
=15/2 (2×5+14×3)
=15/2 (10+42)
=15/2 (52)
=15×26=390
Therefore,sum of 15 terms is 390.plz mark me as brainlist. Hope this may help u
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