Q45 (2016). 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
UPSC Civil Service (Preliminary) 2016 - GS2 - CSAT
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