1 4 7 10 2 5 8 11 3 6 9 12

I want to print this matrix in c language.

How did this formula come out? 3 * j + i + 1);

#include

int main() { int y[3][4]; int i, j; for (i = 0; i < 3; i++) { for (j = 0; j < 4; j++) printf("%d ", 3 * j + i + 1); printf(" "); } return 0; }