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smallsorrow
- Master | Next Rank: 500 Posts
- Posts: 109
- Joined: Mon Sep 08, 2008 12:47 am
1. (a-7)(b-7)(c-7) =0
Means, atleast one is equal to 7. It's possible that all are equal to seven.
Insufficient.
2. bc = 18
We can't find the value of a. Insufficient.
1 & 2
From 2, if either b or c is equal to 7 then bc can't be 18. Hence, b!=7 and C != 7. From 1, a must be 7.
IMO C.
