Posted by **Aisha** on Sunday, October 15, 2006 at 10:38am.

How many n-digit decimal sequences (using digits 0-9) are there with k

1s?

Decimal sequences meaning you can have as many 0s in front of a number. For example:

000001234557891111 would be consider valid. So how do i come up with an equation?

See my response to Sana's question right below yours.

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