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GMAT - Data Sufficiency - Algebra

Is rst = 1 ?

Is rst = 1 ?

(1) rs = 1
(2) st = 1

Statement 1:

rs = 1

doesn't say anything about t. Insufficient

Statement 2:

st = 1

doesn't say anything about r. Insufficient

 

Combined:

rs= 1

st = 1

Example to  prove insufficiency, r = 1/2, s = 2, t = 1/2

it satisfies both the statements but rst = 1/2

so E.