How many 4digit no.'s can be formed using the digits {1, 3, 4, 5, 7,9}repetition of digits is not allowed?	Choose the correct choice from the following choices
A) 200
B) 220
C) 240
D) 250
E) 360
The given digits are six.   The number of four digit numbers that can be formed using six digits is 6P4 = 6 x 5 x 4 x 3 = 360.   360
<result>E</result>
How many 4digit no.'s can be formed using the digits {1, 3, 4, 5, 7,9}repetition of digits is not allowed?