Thanks so much for the help! I can provide the details on slot machine probabilities. Here you go:
3x Grapes: 9.39% (1 in 10.65 spins)
3x Cherries: 1.41% (1 in 71 spins)
3x Dollar Sign: 0.60% (1 in 166 spins)
3x "7" (Jackpot): 0.17% (1 in 592 spins)
