the sum of first fifteen multiple of 8 is with solutions
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Step-by-step explanation:
8 , 16 , 24 , .............., 120
S(15) = 15/2 { 2(8) + (15-1)8 }
= 15/2 { 16 + 112 }
= 15/2 × 128
= 15 × 64 = 960
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