Question

A retailer sends scratch-off coupons to registered customers; 30% of the coupons will reveal a discount of 50%.

Before mailing, a manager selects 10 coupons at random from the stack of printed coupons and scratches to
reveal the discount.
What is the probability that at least one of the coupons will reveal a discount of 50%?

Answer 1

C) 0.972

Explanation:

I am just as confused as you are but i tried understanding what "at least one" meant and my 2nd option was X>= 1, or something to that effect where 10 to 1 coupons being possible.