Determine the convergence or divergence of the series. (If you need to use or –, enter INFINITY or –INFINITY, respectively.) [infinity] 2(−1)n + 1 en + e−n n = 1 = [infinity] (−1)n + 1 sech(n) n = 1 lim n→[infinity] sech(n) =

20

step-by-step explanation:

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

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