Number System Practice Test 2

Any number, that is divisible by 3 and 11 will also be divisible by 33.
The sum of digits of 9,61,191 = 27, (i.e., the number is divisible by 3).
Also, 9,61,191: 19 - 8 = 11, divisible by 11.
So, the number is divisible by 33.