find the sum of first 15 multiples of 8(from A.P.chapter)
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AP 8 , 16 , 24 .......... 120
S = n/2 (2 a+ (n-1) d )
= 15/2 ( 2×8 + 14 × 8 )
= 15/2 ( 16 + 112)
= 15/2 ( 128 )
= 15 × 64
= 960
Sum of 15 multiples of 8 = 960
Hope it will help you
AP 8 , 16 , 24 .......... 120
S = n/2 (2 a+ (n-1) d )
= 15/2 ( 2×8 + 14 × 8 )
= 15/2 ( 16 + 112)
= 15/2 ( 128 )
= 15 × 64
= 960
Sum of 15 multiples of 8 = 960
Hope it will help you
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