1 boy forgot the last digit of a 7 digit telephone no. If he randomly dial thefinal 3 digits after correctly dialing the 1st four, then what is the chance of dialing the correct no.? Choose the correct choice from the following choices:
A) 2/989	B) 3/456	C) 1/1000	D) 1/2314	E) 2/2315
it is given that last 3 digits are randomly dialed   Then, each of the digit can be selected out of 10 digits in 10 ways. Hence, required probability   = 1/(10)3 = 1/1000   1/1000
<result>C</result>
1 boy forgot the last digit of a 7 digit telephone no. If he randomly dial thefinal 3 digits after correctly dialing the 1st four, then what is the chance of dialing the correct no.?