Consider the proper subsets of 1, 2, 3, 4 . How many of these proper subsets are superset of the set 3 ?

NDA 2020 Mathematics question

Consider the proper subsets of . How many of these proper subsets are superset of the set ?

Answer: (C)

A superset of must contain 3; each of 1, 2, 4 may or may not be included, giving $ =

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Question ID VK-029218