(b) Any number is divisible by 4, if the last two digits of that number is also divisible by 4. Now, 2-digit numbers which is divisible by four ={16,36,44,48,56,64,68,84,88,96} ∴ Number of ways = 10 Total 3-digit numbers which is divisible by four= 7 x10 = 70 ∴Required number of ways = 70 +10 = 80