(6)(−3)(−5) ........................
1 answer:
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The first and third selections are infinite sums. The given sum is finite, so those choices are incorrect.
The second choice fails to give the correct value for n=0. (It gives 0, not -3.)
Thus, all choices are eliminated except the last one. It gives the summation of the correct terms for the correct number of terms.
The 4th selection is correct:
The second choice fails to give the correct value for n=0. (It gives 0, not -3.)
Thus, all choices are eliminated except the last one. It gives the summation of the correct terms for the correct number of terms.
The 4th selection is correct: