pyq/2016/csat/72

Four-digit numbers are to be formed using the digits 1, 2, 3 and 4; and none of these four digits are repeated in any manner. Further,

1. 2 and 3 are not to immediately follow each other.

2. 1 is not to be immediately followed by 3.

3. 4 is not to appear at the last place.

4. 1 is not to appear at the first place.

How many different numbers can be formed?

(A) 6

(B) 8

(C) 9

(D) None of the above