Question

if you make random quesses for a 10 multiple choice test with 5 possible answers each what is the probabilit of getting at least 1 correct?

Answer 1

P(at least 1 correct) = 1 - P(all question are false)

Answer 2

and you have :
P(correct) = 1/5 and
P(false) = 4/5

Answer 3

so, it is
P(at least 1 correct) = 1 - (4/5)^10

Answer 4

thank you