The H.C.F of 13 & 7 is
Factors of 13: 1, 13
Factors of 7: 1, 7
The only common factor is 1.
Hence the H.C.F of 1, 13 is 1.
H.C.F of a2b3 and a3b2d7 is a2b2. What is their H.C.F
Two numbers are in the ratio of 15:11. If their H.C.F is 13, the numbers will be: