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How many seven-digit numbers are there, the sum of whose digit is even?

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PATHFINDER-PERMUTATION AND COMBINATIONS-QUESTION BANK
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  3. How many seven-digit numbers are there, the sum of whose digit is even...

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  4. How many five-digit telephone numbers are there, the sum of whose digi...

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  5. How many 4 digit numbers can be formed from the digits 1, 1, 2, 2, 3, ...

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  6. Find the number of students to be selected at a time from a group of 1...

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  7. Find the sum of the five digit numbers formed by the digits 2, 3, 4, 5...

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  8. A boat has a crew of 8 men of which 2 can row only on one side and onl...

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  15. How many ways n distinct objects be placed in 2 different boxes so tha...

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  16. How many ways the three angular points of a regular decagon can be sel...

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