Question

How many 4 digit pins have two 1's but you dont know where?

Answer #1

How many 4 digit PINs have two 1s but you don’t know where?

How many 4 digit PINs have two 1s but you don’t know where?
(Please explain step by step)

Suppose you have totally forgotten a 5-digit PIN to open a door
locker. There are five distinct digits in the PIN, excluding zero.
(a) If you test one 5-digit PIN every 11 seconds, how many minutes
will it take to test all possible PINs? Answer =Answer [2 marks]
(b) If the system requires you to press the first two digits
simultaneously and then the other three digits one at a time a. How
many possible PINs can you enter? Answer...

how
i can calculate RB angles if i dont know where is laying but i know
the vertical and WCB angles
however i do not have any graph

how
many ways can you make 4 digit odd number from 0 1 2 3 4 5 without
repeated numbers

How many diffrent two-digit numbers can you use the
digits 4,3,7,1,2,6, and 9 without repetition? For example, 77 is
not allowed
The number of diffrent two-digit number is

Counting theory: Find how many 4-digit positive
integers are there with no repeating digits (e.g.: 5823) or where
digit repetition is allowed but all digits must be odd (e.g.: 5531
satisfies this condition but 7726 and 6695 do not since they
contain even digits).

Consider a seven digit telephone number where the first digit
can not be zero.
• How many different such seven-digit telephone number can be
formed?
• What is the probability that a randomly selected telephone
number starts with 541?

How many two-digit counting numbers do not contain any of the
digits 1, 3, or 9?
42 numbers
72 numbers
81 numbers
49 numbers

discrete math counting problem
How many positive 4 digit numbers ( using digits 1-9) that
contain at least one 1 and at least one 2 are there?

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