When gambling is voted to be valid, each player will be decided to roll number of dices according to the number of items chosen to gamble. Is the points counted separately on each dices instead of sum up all points on all dices a player rolled?

2 players A and B
player A rolls 2 dices 3,4
player B rolls 1 dice 6
Who is the winner?

Extreme cases if player A rolls 7 dices and B only rolls 1 dice
Player B will never win the gambling if the points are summed up.
How could a gambling results in 100% win?