Find the sum of 1st 15 multiple of 8.
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8
8, 16, 24.......
a = 8
d = 8
n = 15
Sn = n/2 [ 2a +(n-1) d]
S15 = 15 /2 [ 2 × 8 + 14 × 8]
S15 = 15/2 [ 16 + 112]
S15 = 15 × 128 / 2
S15 = 15 × 64
S15 = 960
a = 8
d = 8
n = 15
Sn = n/2 [ 2a +(n-1) d]
S15 = 15 /2 [ 2 × 8 + 14 × 8]
S15 = 15/2 [ 16 + 112]
S15 = 15 × 128 / 2
S15 = 15 × 64
S15 = 960
Answered by
2
multiples of 8 is 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120.
On adding those
we get 960.
TQ.
All the best.
On adding those
we get 960.
TQ.
All the best.
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