Calculate the highest common factor (HCF) of 84, 126, and 210.
Note
Prime factors: 84 = 2^2·3·7, 126 = 2·3^2·7, 210 = 2·3·5·7; common factors are 2·3·7 = 42, the HCF.
Calculate the highest common factor (HCF) of 84, 126, and 210.
Prime factors: 84 = 2^2·3·7, 126 = 2·3^2·7, 210 = 2·3·5·7; common factors are 2·3·7 = 42, the HCF.