Question
$\sum_{k=1}^{n} k=1+2+3+\cdots+n=$ _____.(a) $n !$(b) $\frac{n(n+1)}{2}$(c) $n k$(d) $\frac{n(n+1)(2 n+1)}{6}$
Step 1
Step 1: We are given the sum of the first n natural numbers, which is represented by the summation notation $\sum_{k=1}^{n} k$. Show more…
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Multiple Choice $\sum_{k=1}^{n} k=1+2+3+\cdots+n=$ ________. (a) $n !$ (b) $\frac{n(n+1)}{2}$ (c) $n k$ (d) $\frac{n(n+1)(2 n+1)}{6}$
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