Question

Yesterday PISA question
We want to make phone numbers of 10 digits using digits 0, 1 ,2, 3, 4 ,5, 6 ,7, 8 ,9. How many phone numbers can we make
Q 1 By repeating the digits for any number of times?
Q2 If repetition is not allowed at all ?
Q3 VVIP numbers such as 0000000000
Q 4 By keeping 98 in the starting ?
Q 5 How are phone numbers useful in lock down period?​

Answer 1

Answer:

question is not clear

Step-by-step explanation:

Answer 2

10 using the number Q1 answer :- yes Q2:- no Q3:- no Q4 :- yes Q5:- yes