InterviewSolution
Saved Bookmarks
| 1. |
If two sets A and B have 17 elements in common, then the number of elements common to the set A × B and B × A is (a) 217 (b) 172 (c) 34 (d) insufficient data |
|
Answer» (b) 172 n (A ∩ B) = 17 So n [(A × B) ∩ (B × A)] = n(A ∩ B) × n(B ∩ A) = 17 × 17 = 172 |
|