Lena found the greatest common factor (gcf) of 24ab2c3 and 30a2b3c2 to be 6abc2 by using these steps:
step 1: gcf of 24 and 30 is 6
step 2: highest shared power between a and a2 is a
step 3: highest shared power between b2 and b3 is b
step 4: highest shared power between c3 and c2 is c2
in which step did lena make a mistake?
a) step 1
b) step 2
c) step 3
d) step 4
e) lena's work is correct.