Mathematics
If A = {x : x ∈ N and x is an odd prime number less than 17}, then the cardinal number of A is
8
6
5
none of these
Sets
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Answer
The prime numbers less than 17 are 2, 3, 5, 7, 11 and 13. Out of these, the odd primes are 3, 5, 7, 11 and 13.
A = {3, 5, 7, 11, 13}
So, the cardinal number of A = 5 i.e. n(A) = 5.
Hence, option 3 is the correct option.
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