Advertisements
Advertisements
प्रश्न
How many six-digit telephone numbers can be formed if the first two digits are 45 and no digit can appear more than once?
Advertisements
उत्तर
Let the telephone number be 45 abcd
| Number of ways to fill | |
| a | 8 |
| b | 7 |
| c | 6 |
| d | 5 |
Required number = 8P4 = 1680
APPEARS IN
संबंधित प्रश्न
Evaluate 4! – 3!
Compute `(8!)/(6! xx 2!)`
How many 4-digit numbers are there with no digit repeated?
Find x in each of the following:
A customer forgets a four-digits code for an Automatic Teller Machine (ATM) in a bank. However, he remembers that this code consists of digits 3, 5, 6 and 9. Find the largest possible number of trials necessary to obtain the correct code.
In how many ways can 7 letters be posted in 4 letter boxes?
Write the number of 5 digit numbers that can be formed using digits 0, 1 and 2 ?
Write the total number of possible outcomes in a throw of 3 dice in which at least one of the dice shows an even number.
The number of six letter words that can be formed using the letters of the word "ASSIST" in which S's alternate with other letters is
If (n+2)! = 60[(n–1)!], find n
Three men have 4 coats, 5 waist coats and 6 caps. In how many ways can they wear them?
How many strings can be formed from the letters of the word ARTICLE, so that vowels occupy the even places?
How many ways can the product a2 b3 c4 be expressed without exponents?
In how many ways can the letters of the word SUCCESS be arranged so that all Ss are together?
Find the sum of all 4-digit numbers that can be formed using digits 1, 2, 3, 4, and 5 repetitions not allowed?
Find the sum of all 4-digit numbers that can be formed using digits 0, 2, 5, 7, 8 without repetition?
Find the number of different words that can be formed from the letters of the word ‘TRIANGLE’ so that no vowels are together
The number of different words that can be formed from the letters of the word INTERMEDIATE such that two vowels never come together is ______.
The number of three-digit even numbers, formed by the digits 0, 1, 3, 4, 6, 7 if the repetition of digits is not allowed, is ______.
Number of words from the letters of the words BHARAT in which B and H will never come together is ______.
