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An n-digit number is a positive number w...

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. Find the smallest value of n for which this is possible.

A

6

B

7

C

8

D

9

Text Solution

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The correct Answer is:
B
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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 a. 6 b. 7 c. 8 d. 9

An n-digit number is a positive number with exactly n 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 (a) 6 (b) 7 (c) 8 (d) 9

Number of 5-digit numbers can be formed using the digits 2,4,7,9,0 if no digit is repeated :

Number of 6 digit numbers that can be formed using digit 2 two times and the digit 5 four times is

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The number of 4 digit numbers that can be formed with the digits 2,3,4,7 and using each digit only once is

Find the number of three-digit numbers which are divisible by 5 and have distinct digits

Determine the product of the greatest number of three digits and the smallest number of two digits.

The number of different four - digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is

The number of 6 digits numbers that can be formed using the digits 0, 1, 2, 5, 7 and 9 which are divisible by 11 and no digit is repeated is

AAKASH INSTITUTE ENGLISH-PERMUTATIONS AND COMBINATIONS -Assignment Section B Objective type questions (One option is correct )
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