EASY
CAT
IMPORTANT
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In the Sunita Building in Mumbai, there are 12 floors plus the ground floor. 9 people get into the lift of the building on the ground floor. The lift does not stop on the first floor. If 2, 3 and 4 people alight from the lift on its upward journey, then in how many ways can they do so? (Assume they alight on different floors.)

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Important Questions on Permutations and Combinations

EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 42
There are 40 doctors in the surgical department of the AIIMS. In how many ways can they be arranged to form a team with 1 surgeon and 4 assistant.
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 47

How many five-digit numbers, which do not contain identical digits, can be written by means of the digits 1, 2, 3, 4, 5, 6, 7, 8, 9?

EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 50
How many different four-digit numbers can be written using 1, 2, 3, 4, 5, 6, 7, 8 only once such that the number  2 is contained once?
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 1
The number of ways in which four particular persons A, B, C, D and six more persons can stand in a queue so that  A always stands before B, B always before C and C always before D is:
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 2
The number of circles that can be drawn out of 10 points of which 7 are collinear is:
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 3
How many different 9-digit numbers can be formed from the number 223355888 by rearranging its digits so that the odd digits occupy even positions?
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 4
How many diagonals are there in an n-sided polygon (n>3)?
EASY
CAT
IMPORTANT
How to prepare for Quantitative Aptitude for the CAT>Chapter 26 - Permutations and Combinations>Level of Difficulty>Q 5
A polygon has 54 diagonals. Find the number of sides.