The given expression is

Let's replace x = 7 and y = -2.

<h2>Therefore, the value of the expression is 20.</h2>
Answer:

Step-by-step explanation:



Answer:
Step-by-step explanation:
Let X be the no of customers who purchase atleast one item.
X is binomial since there are two outcomes and each customer is independent of the other.
a) Here n =10
Out of 10 customers we expect np = 3 customers to buy at least one item.
b) exactly 3 of the customers would purchase at least one item
=
c) the probability that no more than 3 customers would purchase at least one item
=