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Let A={1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. Then the number of subsets of A containing two or three elements isA. 45B. 120C. 165D. 330 |
Answer» Correct Answer - C Given, A{1, 2, 3, 4, 5, 6, 7, 8, 9, 10} Set A has 10 elements. Number of sub sets Containing 2 and 3 elements is `10_(c_(2))+10_(c_(3))` `10_(c_(2))+10_(c_(3))=(10xx9)/(2)+(10xx9xx8)/(3xx2)` `=45+120=165` |
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