Given six numbers, find a method of computing by using not
more than 15 additions and 14 multiplications the following five numbers:
the sum of the numbers, the sum of products of the numbers taken two
at a time, and the sums of the products of the numbers taken three, four,
and five at a time.

Question

Given six numbers, find a method of computing by using not
more than 15 additions and 14 multiplications the following five numbers:
the sum of the numbers, the sum of products of the numbers taken two
at a time, and the sums of the products of the numbers taken three, four,
and five at a time.

anonymous · Answer

Is each addition of n numbers counted as one or n additions? (same for multiplication)