FIND THE SUN THE FIRST 15 MULTIPLE OF 8.
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it's 960
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Answer:
Step-by-step explanation:a=8,d=8,n=15,Sn=?
Sn=n/2 (2a+(n-1)d)
=15/2 (2(8)+(15-1)8)
=15/2 (16+14x8)
=15/2 (16+112)
=15/2 x 128
=15x64. (128/2=64)
=960.
The sum of first 15 multiples of 8 is 960.
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