Answer: 12, 162. This rule should be found by jumping, that is, look at the odd number (12579) first, and then look at the even number (2468 10). Odd numbers, 2, 6, 18, 54,? Obviously, the last one is three times as big as the previous one, and 54×3 gets 162, which proves that 162×3 gets 486, which is correct. Look at the even number, 9, 10, 1 1,? 13 Needless to say!