This question uses permutation and combination. Because there is an absolute value, you can take a negative sign. There are three situations.

①. Two zeros

②. Three zeros

③. Four zeros

Corresponding number c (2,5) * 2?

C(3，5)*2？

c(4.5)* 2

C(X, x) is a permutation and combination operation symbol. If you don't understand, read a book or Baidu operation method yourself. Thank you.