self Maths Puzzle Numerical Ability Permutation and Combination

How many numbers grater than 2300 can be formed from digit 1,2,3,4,5?repetition not allowed

Read Solution (Total 1)

2 cases are here

case1- when 2 occurs at thousand's place

thousand place can be filled up by 1 way
hundred place can be filled up by 3/4/5 in 3 ways
remaining 2 place can be filled by 5p2 ways

number of numbers in this case= 1*3*5p2=60

case-2 when anyone of 3,4,5 occurs at thousand place

thousand place can be filled up by 3,4,5 by 3 ways
remaining place can be filled up by 5p3
number of numbers formed in this case
3*5p3=180

required number=180+60=240
10 years agoHelpfull: Yes(0) No(1)

self Other Question

make 10 crores using seven 2's? A husband drives his wife to the railway station every morning and in the evening exactly at 6:00pm he picks her up & takes her home.One day she was let off at work an hour earlier and arrived at the railway station at 5:00pm instead of 6:00pm.She started walking home. However ,she met her husband enroute the station and got into the car. They drove home arriving 10mins earlier than usual.How long did the wife had to walk , before she was picked up by her husband?