SSC CGL 2024 PYQ — Question 57

SSC CGL - 12 Sep 2024 - Shift 2 • Quantitative Aptitude • Q57

Which of following numbers is NOT divisible by 11?

Show answer & explanation

Correct answer: C

Explanation

The correct answer is option 3 i.e. 128041.

Divisibility rule of 11: This rule stated that a number is divisible by 11 when the difference between the sum of the digits at the odd place and the sum of the digits at the even place is equal to 0 or 11.

According to the given options,

Option 1: 109153

Sum of digits at odd places = 1 + 9 + 5

⇒ 15

Sum of digits at even places = 0 + 1 + 3

⇒ 4

Differece = 15 - 4 = 11  (Divisible)

Option 2: 5445

Sum of digits at odd places = 5 + 4

⇒ 9

Sum of digits at even places = 4 + 5

⇒ 9

Differece = 9 - 9 = 0  (Divisible)

Option 3: 128041

Sum of digits at odd places = 1 + 8 + 4

⇒ 13

Sum of digits at even places = 2 + 0 + 1

⇒ 3

Differece = 13 - 3 = 10  (Not divisible)

Option 4: 80124

Sum of digits at odd places = 1 + 8 + 4

⇒ 13

Sum of digits at even places = 2 + 0 

⇒ 2

Differece = 13 - 2 = 11  (Divisible)

Hence the required answer is 128041.