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nova- d.s

by Nidhs » Wed Jan 30, 2008 7:12 pm
An integer greater than 1 is prime if it is divisible only by 1 and itself and 1. Is n prime?
1) n is between 1 and 4,
2) n^2-5n+6=0

Ans is D but i chose b. my thought process was- Although n is in between 1 and 4, there is no way of knowing whether n is an integer. Can someone please explain?
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by Saffa » Thu Jan 31, 2008 4:01 am
The question should probably have stated: An integer n is prime if....Is n prime?

1) Then SUFF as n =2 or n = 3

2) SUFF (n^2) - 5n + 6 = 0
(n - 3)(n - 2) = 0

n =2 or n = 3
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