Current location - Training Enrollment Network - Mathematics courses - A topic of "200 1 Zhejiang Primary School Mathematics Summer Camp"
A topic of "200 1 Zhejiang Primary School Mathematics Summer Camp"
How many * * * meet the requirements of thousands > hundreds > tens > single digits?

It can be regarded as 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, * * with c (10/0,4) = (10 * 9 * 8 * 7)/(4 * 3 *).

How many * * * match the thousands?