How many four digit numbers divisible by 4 can be made with digits 1, 2, 3, 4, 5 if the repetition of digits is not allowed?	Answers.
A) 10  B) 20  C) 30  D) 40  E) 50
A number is divisible by 4 if the last 2 numbers are divisible by 4 (divisible by 2 twice)   Ending can be   12   24   32   42   52   Case: Ending with 12,24,32,42,54   First digit - 3 choices   Second digit - 2 choices   Third digit - 1 choice   Fourth digit - 1 choice   6 possible choices for each ending (e.g. 3412,3512, 3212 ,4512 ,5312 ,5412)   Total number of 4 digit numbers divisible by 4 = 6 * 5= 
<gadget id="calculator">6 * 5</gadget>
<output>30</output>
30   ANSWER:30
<result>C</result>
How many four digit numbers divisible by 4 can be made with digits 1, 2, 3, 4, 5 if the repetition of digits is not allowed?