2^a = 3 ==> lg 2^a = lg 3 ==> a = lg3/lg2 = lg3/lg2 2^b = 6 ==> lg 2^b = lg 6 ==> b = lg6/lg2 = (lg2 + lg3) / lg2 = 1 + lg3/lg2 2^c = 12 ==> lg 2^c = lg 12 ==> c = lg12/lg2 = (lg4 + lg3) = 2+ lg3/lg2 ...