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The sum of first 15 terms of AP whose terms are multiple of 6 |
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Answer» ONG>Answer: 720 Step-by-step EXPLANATION: SN= n/2 (2a+(n-1)d) n=15, a=6, d=6 Sn= 15/2 (2 (6)+(15-1)6) Sn=15/2 (12+(14)6) Sn=15/2 (12+84) Sn=15/2 (96) Sn=15×48 Sn=720 |
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