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04 Jul 2022, 03:15
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
55% (00:55) correct
45%
(00:57)
wrong
based on 64
sessions
History
Date
Time
Result
Not Attempted Yet
How many 2 element subsets of {4, 5, 6, 7} are there that do not contain the pair of elements 5 and 7?
A. 1
B. 2
C. 4
D. 5
E. 6
A. 1
B. 2
C. 4
D. 5
E. 6
KabirKanha
08 Jul 2022, 13:16
Kudos
Bookmarks
Total 2-element subsets = 4C2 = 6.
Total 2-element subsets containing 5 AND 7 = 1.
Hence, Ans = 6 - 1 = 5. (Option D)
Total 2-element subsets containing 5 AND 7 = 1.
Hence, Ans = 6 - 1 = 5. (Option D)
