Find the sum of first 15 multiples of 8 AP=
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a=8
d=16-8
d=8
n=15
s=n/2(2a+(n-1)d)
s=15/2(2×8+14×8)
s=15/2(16+112)
s=15/2×128
s=15×64
s=960...........answer
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