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May 30, 2016
Posted by **Shawna** on Friday, March 21, 2014 at 11:33am.

4−(4/n)+(5/n)+(15/3n^2)

A) 20

B) 10

C) 5

D) 4

E) 1

- Math - PreCalc (12th Grade) -
**Reiny**, Friday, March 21, 2014 at 11:46amUse you "sense" of numbers to see what happens to the fractions as n gets larger.

(I think your last term should read 15/(3n^2) or else it becomes large as n gets large)

e.g. look at 5/n

suppose n = 100,000, then 5/n = .00005 , which is close to zero

suppose n = 1,000,000,000 , then 5/n = .000000005, even closer to zero

so as n gets really big

4/n and 5/n each ---> 0

and 15/(3n^2) ---> even faster

so you are stuck with

4 - 0 + 0 + 0 = 4