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  1. Sum of first 15 multiple of 8 is
    1. 960
    2. 660
    3. 1200
    4. 1060
Correct Option: A

First 15 multiple of 8 are 8, 16, 24, ......, 120
Sum = 8 (1 + 2 + 3 + 4 ......+ 15)
= 8 [ n(n + 1) / 2]
= 8 x 15 x 8
960


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