Different Way for using the Combination Formula
Trending Questions
In an interview conducted for ABC Consulting candidates, Global Ltd. candidates, candidates from Avilvar company, from Sona Ltd and one from Bent company, what is the probability that the candidate who would be selected is from Sona Ltd. (It is given that one candidate from Global Ltd. had not come for the interview round and one candidate from ABC Consulting got blacklisted during the interview process.)
In class, there are boys and girls. How many ways a teacher can select boy and girl to represent the class at a seminar?
- 13C5
- 12C5
- 13C7
- 12C7
If persons are seated in a row, the number of ways of selecting persons from them, so that no two of them are seated next to each other is
Out of boys and girls, a group of is to be formed. In how many ways can this be done, if the group is to have a majority of boys?
- 3136
- 56
- 560
- 1
- 1011
- 511
- 611
- 522
- n!(n−r)!×r!
- (n−r)!×r!n!
- r!(n−r)!×n!
- All of the above.
- nCn−r
- nCn
- n!r!(n−r)!
- rCn
- n×(n−1)(n−2)(n−3)…p terms1×2×3×…p terms
- n×(n−1)(n−2)(n−3)…p terms1×2×3×…n terms
- n×(n−1)(n−2)(n−3)…n terms1×2×3×…p terms
- None of the above