How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?	Answers
A) 360 B) 197 C) 278 D) 279 E) 274
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)?