<u>Complete Question</u>
The usher at a wedding asked each of the 80 guests whether they were a friend of the bride or of the groom. The results are: 59 for Bride, 50 for Groom, 30 for both. Find the probability that a randomly selected person from this sample was a friend of the bride OR of the groom.
Answer:
0.9875
Step-by-step explanation:
Total Number of Guests which forms the Sample Space, n(S)=80
Let the Event (a friend of the bride) =A
Let the Event (a friend of the groom) =B
n(A) =59
n(B)=50
Friends of both bride and groom, 
Therefore:

The number of Guests who was a friend of the bride OR of the groom = 79
Therefore:
The probability that a randomly selected person from this sample was a friend of the bride OR of the groom.

Answer:
3 is the answer haha its not 4
Remember PEMDAS (Parentheses, Exponents, Multiplication ⇔ Division, Addition ⇔ Subtraction). This is the order that you solve expressions in.
5 * 5 - 4 + 445 * 7 + 41 - 82 Multiply 5 and 5
25 - 4 + 445 * 7 + 41 - 82 Multiply 445 and 7
25 - 4 + 3115 + 41 - 82 Subtract 4 from 25
21 + 3115 + 41 - 82 Add 21 and 3115
3136 + 41 - 82 Add 3136 and 41
3177 - 82 Subtract 82 from 3177
3095
A negative times a negative is a positive.
because 2 negatives equals positive.
I HOPE THIS HELPS!!. HAVE FUN!!