1. The units digit of n is greater than the units digit of s
34 and 41 - No, 66 and 64 - Yes --- Insufficient
2. the tens digit of n is greater than the tens digit of S
78 and 63 - yes , 44 and 31 - yes ---- Sufficient
B.
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n and s
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Source: Beat The GMAT — Data Sufficiency |












