What is the H.C.F. of 4/9, 10/21 and 20/63?

Question: What is the H.C.F. of 4/9, 10/21 and 20/63?Solution:H.C.F of 4/9, 10/21 and 20/63 = H.C.F of 4,10 and 20 / L.C.M of 9,21 and 63H.C.F of 4, 10 and 20 = 2 & L.C.M. of 9, 21 and 63 = 63. ∴ Required H.C.F. = 2/63