Q.

The number of even numbers between 200 and 20,000 can be formed with the digits 0,1,2,3,4 when repetitions are not allowed is

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a

96

b

120

c

99

d

144

answer is C.

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Detailed Solution

3 digit even numbers greater than 200 using 0,1,2,3,4

2, 3, 4

 

0

       3                                           ending with 0 =  3×3=9

 3, 4

 

2

       2                                           ending with 2 =  2×3=6

                                                    Start with 3, 4

 

2, 3

 

4

                                                   ending with 4 =  2×3=6

                                                    Start with 2,3

 

4 digit even numbers end with 0=  4P3=24

                                                                  

 

 

 

0

               

                                                   

4 digit even numbers end with 2, 4 =2(4P3-3P2)=36

 

 

 

2

                 0, 1, 3, 4

 

4 digit even numbers begin with 1 = 3×3!=18

1

 

 

0, 2, 4

                                                   

Total no of even numbers between 200, 20,000

             =9+6+6+24+36+18=99

                      Option (3)

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