We know that, if a number is divisible by 88 , it must be divisible by 8 and 11 both. Divisibility rule for 8 - Number formed by last three digits of a number is divisible by 8 . Divisibility rule for 11 - The difference of the sum of the digits at odd places and even places is 0 or divisible by 11 . Here, all four options are divisible by 8. Now, let's check the divisibility of 11. From option (a), 2776408=(2+7+4+8)−(7+6+0) =21−13=8 Which is not divisible by 11) From option (b), 2776400=(2+7+4+0)−(7+6+0) =13−13=0 Hence, 2776400 is divisible by 88.