(C) The pattern followed in the series is: $(n \times \text{position}) + (\text{position} + 1)$.$4 \times 1 + 2 = 6$$6 \times 2 + 3 = 15$ (which is no

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(C) The pattern followed in the series is: $(n \times \text{position}) + (\text{position} + 1)$.$4 \times 1 + 2 = 6$$6 \times 2 + 3 = 15$ (which is not $18$)$15 \times 3 + 4 = 49$$49 \times 4 + 5 = 201$$201 \times 5 + 6 = 1011$Since $15$ should be in the place of $18$, the wrong number is $18$.