How many of the positive factors of 63 , 84 and how many common factors are there in numbers?  Answers.
A) 2
B) 4
C) 3
D) 5
E) 1
factors of 63 - 1,3,7,9,21,63   factors of 84 - 1,2,3,4,6,7,12,14,21,28,42,84   Comparing both, we have three common factors of 63 and 84- 1,3,7,21   Answer(4)
<result>B</result>
How many of the positive factors of 63 , 84 and how many common factors are there in numbers?