csat-suneung 2017 Q5

csat-suneung · South-Korea · csat__math-science 3 marks Permutations & Arrangements Forming Numbers with Digit Constraints
Among the numbers $1,2,3,4,5$, if we select four numbers with repetition allowed and arrange them in a row to form a four-digit natural number that is a multiple of 5, how many cases are there? [3 points]
(1) 115
(2) 120
(3) 125
(4) 130
(5) 135 
Among the numbers $1,2,3,4,5$, if we select four numbers with repetition allowed and arrange them in a row to form a four-digit natural number that is a multiple of 5, how many cases are there? [3 points]\\
(1) 115\\
(2) 120\\
(3) 125\\
(4) 130\\
(5) 135
Paper Questions
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