Question

The sum of first five multiplea of 8is

Answer 1

First five multiples of 8 are:

8, 16 , 24, 32, 40

Hence apply

Sn = n/2(a + l)

S5 = 5/2(8 + 40)

S5 = 5/2 × 48 = 5 × 24

S5 = 120

Hence sum is 120


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