How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)? Pick:
A) 360
B) 817
C) 145
D) 346
E) 342
The given digits are six.   The number of four digit numbers that can be formed using six digits is ⁶P₄   = 6 * 5 * 4 * 3= 
<gadget id="calculator">6 * 5 * 4 * 3</gadget>
<output>360</output>
360.   360nswer: 360
<result>A</result>
How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?