Question

dialing a telephone number an old person forget last three digits remembering only that these digits are different he dialed at random what is the chance that the number dialied is correct​

Answer 1

Given :  dialing a tele ph one number an old person forget last three digits remembering only that these digits are different he dialed at random

To Find :  what is the chance that the number dialed is correct​

Solution:

old person forget last three digits  

these digits are different  

Total  digits = 10

3 Digits out of 10 can be selected in ¹⁰C₃  =  120 ways

and 3 digits can be selected in 3 !  = 6 Ways

Total possible last 3 digits = 120 x 6  

= 720

Correct number can be only 1

Hence  chance that the number dialed is correct​ = 1/720

Learn More:

if two dice are tossed, find the probability of   a total of 10 or  

brainly.in/question/7714685

a pair of dice thrown. find the probability of getting a sum of 10 or  

brainly.in/question/7850369

A pair of fair-dice is rolled. What is the probability that the second die  

brainly.in/question/9514304