SSC CHSL 16 Apr 2021 Shift 2 Paper

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),
$2776408=\left(2+7+4+8\right)-\left(7+6+0\right)$
$=21-13=8$
Which is not divisible by 11)
From option (b),
$2776400=\left(2+7+4+0\right)-\left(7+6+0\right)$
$=13-13=0$
Hence, 2776400 is divisible by $88.$