To calculate combinations without counting manually, we use a simple formula. N is the total number of items you have, and R is the number of items you are choosing. The exclamation mark means factorial, which is just multiplying a series of descending numbers. For our fruit salad, N was 4 and R was 2. When we solve the math, we get 6. It matches perfectly! You can use this for any scenario, like choosing a team of players or picking lottery numbers.