Answer:
=9
tanggalin mo yung 0! dahil hindi na yan counted.
1!= 0 x 1 ekis mo na lang din to. gawin mong 1
2!= 1 x 2= 2
1 x 2 x 3= 6
1+2+6= 9
It's specific Repitition yan diba? i don't know kung tama yung answer. Basta ganiyan yung pinagaaralan namin. Kasi kung Permutation yan iba dapat yung problem sa solution.
