How many different five-letter words can be formed using the letter from the wor
How many different five-letter words can be formed using the letter from the world APPLE?
There are 20 couples in a party. Every person greets every person except his or
There are 20 couples in a party. Every person greets every person except his or her spouse. People of the same sex shake hands…
I have an amount of Rs. 10 lakh, which I went to invest in stocks of some compan
I have an amount of Rs. 10 lakh, which I went to invest in stocks of some companies. I always invest only amounts that…
In how many ways can a leap year have 53 Sundays?
In how many ways can a leap year have 53 Sundays?
A selection committee is to be chosen consisting of 5 ex-technicians. Now there
A selection committee is to be chosen consisting of 5 ex-technicians. Now there are 12 representatives from four zones. It has further been decided…
In a certain laboratory, chemicals are identified by a colour-coding system. The
In a certain laboratory, chemicals are identified by a colour-coding system. There are 20 different chemicals. Each one is coded with either a single…
In a hockey championship, there are 153 matches played. Every two team played on
In a hockey championship, there are 153 matches played. Every two team played one match with each other. The number of teams participating in…
What is the value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . . . n × n! where
What is the value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . ….
A box contains 10 balls out of which 3 are red and rest are blue. In how many wa
A box contains 10 balls out of which 3 are red and rest are blue. In how many ways can a random sample of…
When six fair coins are tossed simultaneously, in how many of the outcomes will
When six fair coins are tossed simultaneously, in how many of the outcomes will at most three of the coins turn up as heads?
Out of eight crew members three particular members can sit only on the left side
Out of eight crew members three particular members can sit only on the left side. Another two particular members can sit only on the…
A college has 10 basketball players. A 5 member’s team and a captain will be sel
A college has 10 basketball players. A 5 member’s team and a captain will be selected out of these 10 players. How many different…