MEDIUM
JEE Main/Advance
IMPORTANT
Earn 100

Number of three digit numbers such that atleast one of the digits is 9, repetitions allowed, is

50% studentsanswered this correctly

Important Questions on Permutations and Combinations

EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 18
Number of ways in which the letters of the TAMANNA be arranged is
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 19
Number of three letter words that can be formed using only vowels but each only once is
MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 20
Numbers of different words that can be made using the letters of the word HALLUCINATION if all consonants are together is
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 21
Number of 6 digit numbers that can be formed using the digit 2 two times and the digit 5 four times is
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 22
Number of ways in which 15 billiard balls be arranged in a row if 3 are identical red, 7 are identical white and remaining are identical black balls is
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 23
Number of 7 digit telephone numbers that can be formed from the digits 0,1,2,......9, if each telephone number begins with digit 5 is
MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 24
The total number of permutations of n different objects taken at least one but not more than r at a time, where each object may be repeated any number of times, is
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Mathematics>Chapter 7 - Permutations and Combinations>Assignment>Q 25
An n-digit number is a positive number with exactly n-digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2,5 and 7. The smallest value of n for which this is possible is