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CBSE Notes 2011-2012 » XI-Maths

# Permutations and Combinations

## How many numbers are there between 100 and 1000 such that at least one of the digits is 6 ?

How many numbers are there between 100 and 1000 such that at least one of the digits is 6 ?

## How many 4 digit numbers can be formed using the digits 0, 1,2, 3,4, 5 no digit being repeated ?

How many 4 digit numbers can be formed using the digits 0, 1,2, 3,4, 5 no digit being repeated ?

## How many three digit numbers are there such that 5 is at unit's place ?

How many three digit numbers are there such that 5 is at unit's place ?

## There are four routes between Delhi and Mumbai. In how many ways can a person go from Delhi to Mumba...

There are four routes between Delhi and Mumbai. In how many ways can a person go from Delhi to Mumbai and return, if for returning
(i) any route is taken, (ii) the same route is taken, (iii) the same route is not taken ?

## How may words are there (with or without meaning) of three distinct alphabets ? 