Is there any remainders?¿

Arestaurant gives out a scratch-off card to every customer. the probability that a customer will win a prize from a scratch-off card is 25%. design and conduct a simulation using random numbers to find the experimental probability that a customer will need more than 3 cards in order to win a prize. justify the model for your simulation, and conduct at least 10 trials.

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5