2343, 2345, 2340, 2342, 2343/3=78 1, 2340/3=780, so the total score is 2343 or 2340, * * * hit 78 1 or 780.

People with n(n is an integer) know that n(n- 1)/2=78 1 or n(n- 1)/2=780 according to the knowledge of permutation and combination. (If you haven't learned permutation and combination, just throw it away and don't look at it in the future. )

We know that the solutions of n(n- 1)/2=780 are integers n=40 and n=-39, and n=40.

Male players account for 40*3/4=30, so the second round is 30/6*7=35.