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CBSE Notes 2011-2012 » XI-Maths

# Permutations and Combinations

## 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 ?

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

## How many odd numbers less than 10,000 can be formed using the digits 0, 2, 3, 5 allowing repetition ...

How many odd numbers less than 10,000 can be formed using the digits 0, 2, 3, 5 allowing repetition of digits ?

## How many 4 digit odd numbers can be formed with the help of the digits 1,2, 3,4, 5, if (i) no digit ...

How many 4 digit odd numbers can be formed with the help of the digits 1,2, 3,4, 5, if
(i) no digit is repeated, [NCERT] (ii) digits are repeated ?