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Can someone clearly explain why its 7C1 * 10C2 and not 7C1 plus 10C2? Am missing some core concept here 
- by gokyada
Thu Mar 10, 2011 9:21 pm- Forum: Problem Solving
- Topic: probability
- Replies: 11
- Views: 9142
Given 2x+y=12 and |y|<=12, it means -12 <= y <= 12. For this range, x is between 12 and 0, inclusive. There are only 13 values for x. Hence I can have 13 ordered pairs.
- by gokyada
Thu Mar 10, 2011 8:59 pm- Forum: Data Sufficiency
- Topic: Ordered pairs
- Replies: 6
- Views: 6981