How many two digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?
Choose the correct choice:
A) 30
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   6P2 = 6 * 5= 
<gadget id="calculator">6 * 5</gadget>
<output>30</output>
30.   30nswer: 30
<result>A</result>
How many two digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?