Elitmus
Exam
Numerical Ability
Number System
A three digit number is such dat (eg 2*3*4=24).how many three digit number are possible which saties this.
A)22
B)18)
c)15
Read Solution (Total 11)
-
- 21
as we have to get 24 by multiplication of unit , tens and hundredth digits .
so if 1 is at 100th place then we have 146,164,138,183 only
put 2 at 100th place - 226,262,234,243
3 at 100th place - 324,342,318,381
4 at 100th place - 416,461,423,432
6 at 100th place - 614,641,622
8 at 100th place - 813,831 .
which is total 21 . - 11 years agoHelpfull: Yes(49) No(2)
- Answer is 21.....
24 number is multiple of 3 digit
combinations:
2*3*4=24 combination=3!=6
6*2*2=24 combination=3!/2!=3
1*4*6=24 combination=3!=6
1*8*3=24 combination=3!=6
now sum of combonation=3+6+6+6=21
so Ans is 21.........
- 10 years agoHelpfull: Yes(8) No(0)
- factors of 24= 1,2,2,3
now we have to form 3 digit numbers whose sum of the digits must be equal to 24.
those numbers would be 423,813,614, 226. now the first three numbers can be arranged in 6 ways and the last number(226) can be arranged in 3 ways as it contains two identical number.
so total arrangement would be 6*3+3= 21(ans) - 11 years agoHelpfull: Yes(6) No(2)
- 21 is the correct answer,Mani has done one mistake in i,e 2*2*6 can not be arranged in 6 ways. since there is repetition of 2 thats why it can only be arranged in 3!/2! = 3.
So 6+6+6+3 = 21. - 11 years agoHelpfull: Yes(5) No(0)
- 24 can be made by 1*3*8=24, 3*2*4=24, 1*6*4=24, 2*2*6=24, and each can be arranged in 6 ways so 6*4=24.. so 24 possible number can be there.
- 11 years agoHelpfull: Yes(4) No(4)
- can u explain ?
- 11 years agoHelpfull: Yes(1) No(0)
- Ans. is 21
- 11 years agoHelpfull: Yes(0) No(0)
- ya 21 is the right answr .jaldi jaldi mein galat kar diya maine
- 11 years agoHelpfull: Yes(0) No(0)
- what abt 1*4*9=36.it also came in elitmus
- 10 years agoHelpfull: Yes(0) No(0)
- @ravi for 36.. 18 is the right answer? m i correct?
- 10 years agoHelpfull: Yes(0) No(1)
- 1*3*5=15 (arranged in 6 ways)
1*6*2=12 arraged 6 ways
2*3*4=24(arranged in 6 ways)
3*2*6=36 .............. so ans is 24 or more option d none of the above - 10 years agoHelpfull: Yes(0) No(6)
Elitmus Other Question