MEDIUM
11th ICSE
IMPORTANT
Earn 100
In how many ways can letters be posted in letters boxes so that all the letters are not posted in the same letter box?
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Important Questions on Permutations and Combinations
EASY
11th ICSE
IMPORTANT
Vijeta has friends to invite for her son's birthday party. In how many ways can she send invitation cards to them if she has three servants to carry the cards?
MEDIUM
11th ICSE
IMPORTANT
How many words (with or without meaning) of three English alphabets can be formed? How many of these have all distinct alphabets?
MEDIUM
11th ICSE
IMPORTANT
Two cards are drawn, one at a time, and without replacement, from a deck of cards. Determine the number of ways in which cards can be drawn. What will be the number of ways if the first card is replaced before the second is drawn?
EASY
11th ICSE
IMPORTANT
Eight children are to be seated on a bench. In how many ways can the children be seated?
EASY
11th ICSE
IMPORTANT
Eight children are to be seated on a bench. How many arrangements are possible if the youngest child sits at the left hand end of the bench?
EASY
11th ICSE
IMPORTANT
A number lock on a suitcase has wheels each labeled with ten digits from to . If the opening of the lock is a particular sequence of three digits with no repeats, how many such sequences are possible?
HARD
11th ICSE
IMPORTANT
How many different code words are there such that two distinct English alphabets are followed by two distinct non-zero digits? How many of them end in an odd integer?
HARD
11th ICSE
IMPORTANT
A class consists of boys and girls. In how many ways can a president, vice president, secretary and treasurer can be chosen, if the secretary must be a boy, the treasurer must be a girl and a student may not hold more than one office(position)?
[Enter the answer in integer]
