4 cubed = 4 times 4 times 4 =64
12 + 64 = 76
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The sum of the first n cubed numbers is: [n*(n+1)/2]2 which is the same as the square of the sum of the first n numbers.
- 12 + 4 = - 8
sum means to add so..... 8 + 4 = 12
4
It is: 3*(4+12) = 48