1.

The sum of first 15 terms of AP whose terms are multiple of 6​

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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