If 0<r<1<s<2 , which of the foll must be less than 1??
(1)r/s
max value of r can be .99, min value of s can be 1.01
so .99 /1.01 < 1 hence this would always be less than 1
(2)rs
r =.5 s =1.2 so rs =.6<1
r=.9 s =1.8 rs =1.62>1 NOT SUFF
(3)s-r
s=1.2 r =.8 s-r =.4<1
s=1.9 r =.1 s-r =1.8 >1
not suff
so I only
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Source: Beat The GMAT — Problem Solving |
I dont know why but when I took values like 1/2 , 1/3 , 1/4 and so on for R and 3/4 , 5,4 and 7/6 for S every one of the answer choices were less than 1...But your approach is simple and easy..Thank you
Maxx
