Elitmus
Exam
Numerical Ability
Permutation and Combination
How many five digit numbers can be formed by using the digits 0,1,2,3,4,5 such that the number is divisible by 4?
Read Solution (Total 19)
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- an s= 144
divisible by 4 means last two digit should always div by 4.
unit place=(04,20,40,12,24,32,52)
_ _ _04
_ _ _ 20
_ _ _40
total no=4x3x2x3=72
_ _ _12
_ _ _24
_ _ _32
_ _ _52
total no=3x3x2x4=72
total n0 = 72+72=144 ans
- 9 years agoHelpfull: Yes(70) No(15)
- To get a 5 digit no. we must have one of 1,2,3,4,5 in starting---- 5 ways
remaining 2 places can be filled with 0,1,2,3,4,5 ways-----------6*6 ways
A no. to be divisible by 4, last 2 digits must be divisible by 4 -----8 ways (04,,12,20,24,32,40,44,52)
total: 5*6*6*8=1440 - 9 years agoHelpfull: Yes(14) No(16)
- 144 is correct answer
- 9 years agoHelpfull: Yes(7) No(1)
- 168...w/o repitation
- 9 years agoHelpfull: Yes(7) No(4)
- if no is divisible by 4 the last two digit(unit and tens place) will be 00,04,12,20,24,32,40,44,52 i.e 9 pairs possible and left most place filled in 5 ways and remaining two places filled in 6 ways each.
so total possible combination=5*6*6*9=1620 (repeatition is allowed). - 9 years agoHelpfull: Yes(6) No(2)
- 144 IS THE 100% RIGHT ANSWER WHICH SOLVED BY DEEPAK
- 9 years agoHelpfull: Yes(4) No(3)
- any number is divisible by 4 means the last two digits should be divisible by 4
so...
possible combinations with the given numbers are 04,12,20,24,32,40,52
case 1: combinations including 0
04,40,20
hence 4*3*2 ways are possible for each combination
hence 4*3*2*3=72 ways
case 2:
12,24,32,52
for these numbers , there are only 3 possible ways to fill first digit place
hence 3*3*2 ways
for 4 numbers
3*3*2*4 =72 ways
hence ans is 144 ways
- 9 years agoHelpfull: Yes(4) No(1)
Divisible by 4 means last two digit shouldalways div by 4.
Last 2 digit set may be=(04,20,40,12,24,32,52)
case 1=>
_ _ _04
_ _ _ 20
_ _ _40
total no=4x3x2x3=72
case 2 =>
_ _ _12
_ _ _24
_ _ _32
_ _ _52
total no=3x3x2x4=72
total 5 digit no. = 72+72=144 ans- 8 years agoHelpfull: Yes(4) No(1)
- ans is 600
to be divisble by 4 last two digits should be divisble by 4
_ _ _ 20 ->4*5*5(bcoz digits can repeat as per the question) =100
_ _ _40 ->4*5*5=100
_ _ _12 =100
_ _ _52 =100
_ _ _04 =100
_ _ _24 =100
- 9 years agoHelpfull: Yes(1) No(4)
- ans may be 1620.
1st place 1 to 5 so 5 ways.
2nd place 0 to 5, so 6 place.
3rd place 0 to 5, so 6 place.
4th and 5th place should show that the no is divisible by 4 then 9 ways(00,04,12,20,24,32,40,44,52)
so 5*6*6*9=1620
- 9 years agoHelpfull: Yes(1) No(7)
- For the 5-digit integer to be a multiple of 4, the last two digits must form a multiple of 4.
Options:
04, 12, 20, 24, 32, 40, 52.
Case 1: Last 2 digits include 0
Number options for the last 2 digits = 3. (04, 20 or 40.)
Number of options for the ten-thousands place = 4. (Any of the 4 remaining digits.)
Number of options for the thousands place = 3. (Any of the 3 remaining digits.)
Number of options for the hundreds place = 2. (Either of the 2 remaining digits.)
To combine these options, we multiply:
3*4*3*2 = 72.
Case 2: Last 2 digits do NOT include 0
Number options for the last 2 digits = 4. (12, 24, 32, or 52.)
Number of options for the ten-thousands place = 3. (Any of the remaining 4 digits but 0.)
Number of options for the thousands place = 3. (Any of the 3 remaining digits.)
Number of options for the hundreds place = 2. (Either of the 2 remaining digits.)
To combine these options, we multiply:
4*3*3*2 = 72.
Total options = 72+72 = 144. - 7 years agoHelpfull: Yes(1) No(0)
- NOs which ends with 0 24
nos which ends with 2 24
nos which ends with 4 24
total nos 72 - 9 years agoHelpfull: Yes(0) No(17)
- To get a 5 digit no. we must have one of 1,2,3,4,5 in starting---- 5 ways
A no. to be divisible by 4, last 2 digits must be divisible by 4 -----6 ways (04,,12,20,24,32,40)
remaining 2 places can be filled in 3C2 ways---------------------------6ways
total: 5*6*6=180. - 9 years agoHelpfull: Yes(0) No(7)
- 1*3*4*5*1=60 , as at unit place 4 should b fixed and at frst place we cant take zero so nly 1 number. if no. not repeated this will b ansr
- 9 years agoHelpfull: Yes(0) No(9)
- for without repeation
A no. to be divisible by 4, last 2 digits must be divisible by 4 -----7 ways (04,,12,20,24,32,40,52)
nos which ends with 04 3*2*1
nos which ends with 40 3*2*1
nos which ends with 12 2*2*1
nos which ends with 24 2*2*1
nos which ends with 52 2*2*1
nos which ends with 20 3*2*1
total nos 34
nos which ends with 04
- 9 years agoHelpfull: Yes(0) No(6)
- number of number divisible by 4 ending with 0 = 4*3*2*2(2,4) = 48
2 = 4*3*2*3(1,3,5) = 72
4 = 4*3*2*2(2,4) = 48
total number divisible by 4 = 48+ 72+48 = 168(without repeatation) - 9 years agoHelpfull: Yes(0) No(3)
- 5*4*3*2*3=360
- 9 years agoHelpfull: Yes(0) No(4)
- 126Ans
when unit =0
then ten:2or4
and rest 3 will
3*3*2
total:3*3*2*2:36
now unit:2then ten:1or3or5
so rest:3*3*2
total:3*3*2*3:54
similarly
when unit:4
then total:3*3*2*2:36
Total sum:36+54+36:126 - 9 years agoHelpfull: Yes(0) No(3)
- To get 5 digit no, we can fill first place with 1,2,3,4,5.....5 ways
remaining 2 place can be filled with 0,1,2,3,4,5......6 ways
A no. to be divisible by 4, last 2 digits must be divisible by 4....9 ways (00,04,12,20,24,32,40,44,52)
Total no=9(5x6x6)=1620 ans - 8 years agoHelpfull: Yes(0) No(1)
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