"Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts."
So number of ways:
D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!))
Where...
The following tips are just my advice; they are not absolute. Choose those that will best fit you.
Plan a regular time to study
Choose a quiet place where you will not be distracted.
When...
We all know the prime numbers. Any number which is only divisible by '1' is called a prime number.
Do you know what is coprime? First of all, it is a relative term, i.e. we can't say any number coprime...