Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
EasyThe number of all four-digit numbers which begin with $4$ and end with either $0$ or $5$ is:
- A$200$
- B$64$
- C$256$
- D$32$
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On the occasion of the Dipawali festival, each student of a class sends a greeting card to every other student. If there are $20$ students in the class, the total number of greeting cards sent by the students is:
MediumWBJEE 2018
View SolutionHow many $6$-digit numbers can be formed using the digits of the number $112233$?
Easy
View SolutionThe number of six-letter words (with or without meaning) formed using all the letters of the word $VOWELS$ such that all the consonants never come together is ... .
$10$ men and $6$ women are to be seated in a row so that no two women sit together. The number of ways they can be seated is:
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View SolutionHow many $5$ digit telephone numbers can be constructed using the digits $0$ to $9$,if each number starts with $67$ and no digit appears more than once?
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