Question

A man forgets the last digit of a telephone number and he dials the last digit as random. What is the probability of calling no more than three wrong numbers?​

Answer 1

Answer:

7/10

Step-by-step explanation:

Probability of no. in the last digit (Ps) = 10 (0 to 9)

Let a be the probability of getting the right telephone number after three attempts.

Probability of getting the right telephone number after three wrong attempts(Pa) = 7

Pa/Ps = 7/10