Does anyone have any clue on how to solve this question? Thank you!!
1 answer:
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The first digit of the password can be any of the ten digits - 10 possibilities.
A digit cannot be repeated, so the second digit can be any digit except the one you chose for the first digit - 9 possibilities.
The third digit can be any digit except the digits you chose for the first and second digit - 8 possibilities.
Using the rule of product:
There are 720 passwords.
A digit cannot be repeated, so the second digit can be any digit except the one you chose for the first digit - 9 possibilities.
The third digit can be any digit except the digits you chose for the first and second digit - 8 possibilities.
Using the rule of product:
There are 720 passwords.
Radius [ r ] = 6 units
Area of a circle =
= 
sq. units.
Hence, the answer is B.
Area of a circle =
Hence, the answer is B.