  # If repetition of numbers is not allowed then how many numbers of five digits can be formed by using 1,2,3,4,5...........

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If repetition of numbers is not allowed then how many numbers of five digits can be formed by using 1,2,3,4,5.
If 4 is necessarily taken at hundred's place and 2 is not allowed at unit's place posted Jan 22, 2016

Ans :18 numbers of five digits can be formed.
01) 12435
02) 12453
03) 13425
04) 15423

05) 21435
06) 21453
07) 23415
08) 23451
09) 25413
10) 25431

11) 31425
12) 32415
13) 32451
14) 35421

###### #

15) 51423
16) 52413
17) 52431
18) 53421 answer Jan 22, 2016 answer Jan 31, 2016

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How many numbers of five digits can be formed by using 1,2,3,4,5, if 4 is necessarily taken at hundred's place and 2 is not allowed at unit's place.
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