Question
A Consignment of 12 mobile phones contains 4 defectives. The mobile phones are selected at random one by one and examined. The ones examined are not put back. What is the probability that seventh one examined is the last defective?
More Permutation and combination Questions
- How many 4-digit numbers can be formed using digits 1–9 if repetition is not allowed and the number is even?
- A group consists of 7 boys and 12 girls. In how many ways can 3 boys and 5 girls be selected from the group?
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- In how many different ways can the letters of the word ‘NATURE’ be arranged in such a way that the vowels occupy only the odd positions?
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- Find the number of words that can be formed by using all letters of the word ' FRIDAY', if order of vowels remains same.
- Six students are to be seated in a row. Four of them are boys and the rest are girls. In how many ways can they be arranged such that the two girls do not ...
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