Aptitude - Permutation and Combination - Discussion
Discussion Forum : Permutation and Combination - General Questions (Q.No. 11)
11.
In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?
Answer: Option
Explanation:
| Required number of ways = (7C5 x 3C2) = (7C2 x 3C1) = |  |
7 x 6 | x 3 |  |
= 63. |
| 2 x 1 |
Discussion:
51 comments Page 2 of 6.
Naresh said:
9 years ago
How to get the answer? Please anybody explain me.
(1)
Shivaraj said:
9 years ago
@Feze.
3c1=3 By std formulae.
3c1=3 By std formulae.
Jyoti said:
9 years ago
According to me, the final answer which displayed is wrong.
If we multiply 126 is coming.
If we multiply 126 is coming.
Feze said:
9 years ago
Why we multiply with 3 here?
Dhayithri said:
9 years ago
Here we can also taken as 3c2 as 3c1 because factorial of those two is equal.
Mariyam said:
9 years ago
@Satish your explanation is very understandable.
Mayank said:
9 years ago
@Sudha.
As know this formula n!/r!(n-r)!.
7!/5!2!
3!/2!1!
The answer will be same .
What they have done is try to reduce one step.
As know this formula n!/r!(n-r)!.
7!/5!2!
3!/2!1!
The answer will be same .
What they have done is try to reduce one step.
Sudha said:
9 years ago
How 7c2 will come instead 7C5?
Sam said:
9 years ago
Why we are taking as 7c2 * 3c1? Please explain it.
Anoushka said:
9 years ago
Sir I haven't understood why have we multiplied 3 with 7*6/2*1 *3.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers