All Exams Test series for 1 year @ ₹349 only
Question

13 is related to 117 following a certain logic. Following the same logic, 23 is related to 207. To which of the following is 51 related, following the same logic?

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding /deleting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

This question was previously asked in
SSC CGL 2024 (Tier-I) Previous Year Paper (17-Sep-2024) (Shift 3)
The correct answer is

459

Observing the pattern: 
- 13 is related to 117 
- 23 is related to 207 
Identifying a possible mathematical operation: 
Multiply the given number by 9 and then add 0 (to maintain the pattern). 
- (13 × 9) = 117 
- (23 × 9) = 207 
Applying the same pattern to 51: 
- (51 × 9) = 459 
Thus, the correct answer is Option 2: 459.

Was this answer helpful?

Similar Questions

  1. What should come in place of the question mark '?' in the following number series?

    61, 60, 63, 58, 65, ?

  2. Find the WRONG term in the given series.

    12, 34, 100, 298, 894, 2674

  3. What is the next number in the series?

    10, 30, 90, ___

  4. Complete the series.

    1, 27, 125, ?

  5. 2, 3, 5, 8, 12, 17, ?

  6. 7, 14, 28, 35, 70, ?

  7. Complete the series.

    2, 3, 5, 9, 17, ___

  8. Find the INCORRECT number in the series.

    3, 6, 9, 13, 15, 18

  9. What should come at the place of question mark? : 625, 125, 25, 5, ?, ?

  10. What should come at the place of question mark?

    120, 99, 80, 63, 48, ?


Important Questions from Number Series

  1. Select the number from among the given options that can replace the question mark (?) in the following series.

    15, 45, 75, 105, ?

  2. Identify the number that does NOT belong to the following series.

    18, 27, 35, 45, 54

  3. Select the number from among the given options that can replace the question mark (?) in the following series.

    37, 41, 50, 66, ?

  4. दिए गए विकल्पों में से वह संख्या चुनिए जो निम्नलिखित श्रृंखला में प्रश्नवाचक चिन्ह (?) को प्रतिस्थापित कर सके।

    20, 21, 25, 34,?, 75

  5. Select the correct option that will fill in the blank and complete the series.

    45, 49, 58, 74, .........

Need Expert Advice?
Upcoming Exams
SSC JHT
September 08, 2026
SSC Stenographer
September 09, 2026
SSC Selection Post
September 16, 2026
Test Series
SSC CGL img
SSC
SSC CGL (Tier I + Tier II) 2026 Mock Test Series - Latest Pattern
2500 Tests 6 Tests Free
3990 Attempts
4.2(838)
English, Hindi

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App