imo:C
(1) insufficient as total customers of X are not equal to total customers of A+B division so we cannot get rate of division B by substracting rate of division A from rate of Company X .
(2) insufficient alone
(1) & (2) together are sufficient as we know customers of A & B do not overlap.
GMAT Prep / Division A and B
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Source: Beat The GMAT — Data Sufficiency |
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earth@work
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