EASY
JEE Advanced
IMPORTANT
Earn 100

Total number of non-negative integral solutions of is equal to
(a)
(b)
(c)
(d)
(e)none of these.

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Important Questions on Permutation and Combination
HARD
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IMPORTANT
Total number of positive integral solutions of is equal to

HARD
JEE Advanced
IMPORTANT
Total number of ways in which identical blankets can be distributed among persons, so that each of them gets at least two blankets, is

MEDIUM
JEE Advanced
IMPORTANT
Total number of letter words that can be formed from the letter of the word is equal to

HARD
JEE Advanced
IMPORTANT
identical balls have to be put in different boxes. Each box can contain any number of balls. Total number of ways of putting the balls into box, so that each box contains at least balls, is equal to

HARD
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IMPORTANT
The minimum marks required for clearing a certain screening paper is out of The screening paper consists of sections each of Physics, Chemistry and Mathematics. Each section has as maximum marks. Assuming, there is no negative marking and marks obtained in each section are integers, the number of ways in which a student can qualify the examination, assuming no cut-off limit, is

EASY
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IMPORTANT
The number of ways of distributing identical objects among persons (one or many persons may not be getting any object), is

MEDIUM
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IMPORTANT
A bag contains black, white and red balls, all the balls being different. The number of selections of at most balls containing balls of all the colours, is

EASY
JEE Advanced
IMPORTANT
The number of ways to give different things to three persons, so that gets more than and gets more than , is
