3 Find the sum of the first 15 multiples of 8.
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Answered by
1
Step-by-step explanation:
1,3,5,15 is the sum of 15
Answered by
0
Answer:
a = 8
n = 15
d = 8
So,Sn = n/2 [2a +(n-1)d)
= 15/2 (2×8 + (14)8]
= 15/2 [16 +112]
= 15/2 [128]
= 15 [64]
= 96
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