Discussion

Explanation:

100 ≤ x ≤ 200 and x is odd multiple of 3 which is not divisible by 21.

Number of x those are odd multiples of 3 = 16

Number of x those are odd multiples of 21 = 3

∴ Number of elements in S = 16 − 3 = 13

Hence, option (d).

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