Q63 of 64 Page 122

Using the digits 1, 2, 3, 4, 5, 6, 7, a number of 4 different digits is formed. Find

Given:-total number of digit to be form=4



=7P4=840



Number which are ending with 2


6P3=120


Number which are ending with 4


6P3=120


Number which are ending with 6


6P3=120


how many numbers are exactly divisible by 2=120+120+120=360



=40



The number which last two digit divisible by 4


Are 12,16,24,32,36,44,52,56,64,72,76


11P2.5P2


=200


Answer is above in table



More from this chapter

All 64 →
60

There are 3 books on Mathematics, 4 on Physics and 5 on English. How many different collections can be made such that each collection consists of:

 61

Five boys and five girls form a line. Find the number of ways of making the seating arrangement under the following condition:

 62

There are 10 professors and 20 lecturers out of whom a committee of 2 professors and 3 lecturer is to be formed. Find :

 64

How many words (with or without dictionary meaning) can be made from the letters of the word MONDAY, assuming that no letter is repeated, if