Quantcast
Channel: GMAT Club Forum - Forums > Problem Solving (PS)
Viewing all articles
Browse latest Browse all 462833

GMAT Problem Solving (PS) | Re: If two of the four expressions x+y, x+5y, x-y, and 5x-y are chosen at

$
0
0
only 2 combination helps us get the answer
we can solve it in 2 ways:
1)
a) we need x+y or x-y out of 4, then 2/4
b) then we need either of them, so 1/3
c)2/4*1/3=1/6

Or let's us combinatorics
there are totally 2C4 combinations of the 4 pairs, when 2 are chose. 2C4=6
there is only one combination that suits us, then 1/6

Answer is E

Viewing all articles
Browse latest Browse all 462833

Trending Articles



<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>