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Statistics for Data Science I, Quiz 2

January 2023 term, 2 Apr 2023, Set QPF2

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Question 1

+5−0Single correct

How many 3-digit numbers can be made using only 2 different digits taken from 1 to 9? (Repetition of digits are allowed )

Select one option

A.
288
B.
72
C.
144
D.
216

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How many 3-digit numbers can be made using only 2 different digits taken from 1 to 9? (Repetition of digits are allowed ) The number of whole numbers (starting from zero) smaller than 10⁴of which all the digits are distinct are In a building with five floors (excluding the ground floor), an elevator starts with four people at the ground floor. Each person is equally likely to leave the lift on any floor except the ground floor. What is the probability that two get off at one floor and two get off at another.