UGC NET Computer Science Permutations And Combinations Previous Year Questions (PYQs)
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In a pack of 42 cards, 3 cards are chosen one after the other without replacement.
Find the number of ways this can be done:
1
2
3
4
Solution
Since the cards are drawn “one after the other” and order matters, we use permutations:
Number of ways = \( ^{42}P_3 = 42 \times 41 \times 40 \).
Compute: \( 42 \times 41 = 1722 \), and \( 1722 \times 40 = 68880 \).
UGC NET Computer Science
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UGC NET Computer Science
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and More.
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