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find the 15th term of the sequence: a_(n)=(-1)^n (n+1)

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1 Answer

Do you mean an = (-1)n * (n+1) ?

In that case, just plug in n=15.

a15 = (-1)15 * (15+1) = -1 * 16 = -16

Comments

Yes, thanks so much!!
What about this one?
find the 3rd term in the sequence: a=(-1)n+15n+1

a3 = (-1)3+153+1 = (-1)454 = 1*625 = 625

Now see if you can compute some other problems with calculating terms in sequences. These two examples should give you the enough of an idea. I assume these are from a textbook. Good Luck!