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Grade: Upto college level
        

Q.  How many 6-digit numbers are there, in which the sum of the digits is even?

7 years ago

Answers : (1)

Mayank Jain
37 Points
							

Dear Raghu,

Total no of 6 digit numbers possible = 9x10x10x10x10x10=9 x 105 ( excludign those starting with 0 and when the repetition of digits is allowed)

now 1st no is 100000....teh sum of the digits for this no is 1 which is odd

next no is 100001....the sum of the digits is 2 which is even 

........

this series will go on till 999999

so the required no of 6 digited numbers will be 1/2 of 9 x 105 = 4.5 x 105 = 45 x 104 numbers.. 

 

Ashray Jain

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7 years ago
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