Q.

A five digit number divisible by 3 is to be formed using the numerals 0,1,2,3,4 and 5 without repetition. The total number of ways this can be done is

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a

600

b

240

c

216

d

3125

answer is A.

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Detailed Solution

We 1st  note that a number is dividible by 3 if the sum of the digits is divisible by 3. Hence from the given digits the eligible candidates are 0,1,2,4,5 or 1,2,3,4,5. Number of arrangements in Question Image
 Total number of desired numbers is 96+120=216

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