Find the number of different prime factors of 6440	Choose the correct option.
A) 4 B) 2 C) 3 D) 5 E) 6
Explanation:   L.C.M of 6440 = 2 x 2 x 2 x 5 x 7 x 23   2, 5,7,23   Number of different prime factors is 4.   4nswer: Option 4
<result>A</result>
Find the number of different prime factors of 6440