Find the number of different prime factors of 441  Pick one
A) 4
B) 2
C) 3
D) 5
E) 6
Explanation:   L.C.M of 441 = 3 x 3 x 7 x 7   3, 7   Number of different prime factors is 2.   Answer: Option 2
<result>B</result>
Find the number of different prime factors of 441