A is 90, B is 65, C is 49, and D is 4.
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The opposite of a number is that number multiplied by -1. Therefore, the opposite of 45 is -45
Answer:
The first 4 guests can arrive in 32,760 ways.
Step-by-step explanation:
The order in which the guests arrive is important. For example, A,B,C,D is a different outcome to B,A,C,D. So we use the permutations formula to solve this question.
Permutations formula:
The number of possible permutations of x elements from a set of n elements is given by the following formula:
In this question:
4 guests from a set of 15. So
The first 4 guests can arrive in 32,760 ways.