HARD
JEE Main/Advance
IMPORTANT
Earn 100
different letters of an alphabet are given. Words with five letters are formed from these given letters. Then, the number of words which have at least one letter repeated, is
50% studentsanswered this correctly
Important Questions on Permutation and Combination
MEDIUM
JEE Main/Advance
IMPORTANT
In a conference speakers are present. If wants to speak before and wants to speak after then the number of ways all the speakers can give their speeches with the above restriction if the remaining seven speakers have no objection to speak at any number is
MEDIUM
JEE Main/Advance
IMPORTANT
If all the letters of the word are arranged in all possible manner as they are in a dictionary, then the rank of the word is
HARD
JEE Main/Advance
IMPORTANT
The sum of all the numbers which can be formed by using the digits all at a time and which have no digit repeated, is
MEDIUM
JEE Main/Advance
IMPORTANT
How many nine-digit numbers can be formed using the digits so that the odd digits occupy even position?
MEDIUM
JEE Main/Advance
IMPORTANT
There are identical white balls, identical red balls and green balls of different shades. The number of ways in which they can be arranged in a row so that at least one ball is separated from the balls of the same colour, is:
EASY
JEE Main/Advance
IMPORTANT
A box contains white balls, black balls & red balls. In how many ways can three balls be drawn from the box if atleast one black ball is to be included in draw (the balls of the same colour are different).
MEDIUM
JEE Main/Advance
IMPORTANT
Eight cards bearing number are well shuffled. Then in how many cases the top cards will form a pair of twin prime equals
HARD
JEE Main/Advance
IMPORTANT
Number of natural number upto one lakh, which contains exactly once and remaining digits any time is
