All questions of Number Puzzle for SSC CGL Exam

In the following question, select th e number which can be placed at the sign of question mark (?) from the given alternatives.  (SSC Sten. 2017)
  • a)
    20
  • b)
    78
  • c)
    108
  • d)
    90
Correct answer is option 'A'. Can you explain this answer?

Abhiram Mehra answered
**Solution:**

To solve this question, we need to analyze the given options and find a pattern or relationship between them. Let's analyze each option one by one:

a) 72
b) 78
c) 108
d) 90

From the given options, we need to find the number that can be placed at the question mark (?).

Now, let's analyze the given options:

Option a) 72: The number 72 is divisible by 9, as the sum of its digits (7 + 2 = 9) is also divisible by 9. This property makes it a possible candidate for the answer.

Option b) 78: The number 78 is not divisible by 9, as the sum of its digits (7 + 8 = 15) is not divisible by 9. Therefore, it is unlikely to be the answer.

Option c) 108: The number 108 is divisible by 9, as the sum of its digits (1 + 0 + 8 = 9) is also divisible by 9. This property makes it a possible candidate for the answer.

Option d) 90: The number 90 is not divisible by 9, as the sum of its digits (9 + 0 = 9) is divisible by 9. Therefore, it is unlikely to be the answer.

**Pattern:**

From the given options, we can observe that the numbers that are divisible by 9 (options a and c) have the sum of their digits divisible by 9 as well. On the other hand, the numbers that are not divisible by 9 (options b and d) have the sum of their digits not divisible by 9.

**Conclusion:**

Based on the pattern observed, we can conclude that the correct answer is option 'a' (72) because it satisfies the given pattern. The sum of the digits (7 + 2 = 9) is divisible by 9, which makes it a possible candidate for the answer.

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