21 mangoes trees, 42 apples trees and 56 oranges trees have to be planted in rows such that each row contains the same number of trees one variety only. Minimum number of rows in which the above trees may be planted is ?

21 mangoes trees, 42 apples trees and 56 oranges trees have to be plan

1.	21 mangoes trees, 42 apples trees and 56 oranges trees have to be planted in rows such that each row contains the same number of trees one variety only. Minimum number of rows in which the above trees may be planted is ?
A.	15
B.	17
C.	3
D.	20
Answer» C. 3