arrow
arrow
arrow
Which of the following numbers will replace the question mark (?) in the given series? 17, 23, 27, 29, ?
Question

Which of the following numbers will replace the question mark (?) in the given series?
17, 23, 27, 29, ?

A.

31

B.

30

C.

29

D.

25

Correct option is C

Given: 17, 23, 27, 29, ?
Logic: The differences are6, 4, 2, which decrease by2each time.​
The differences between consecutive numbers:
23 - 17 = 6
27 - 23 = 4
29 - 27 = 2
The next difference should be (since the pattern decreases by 2).
29 + 0 = 29
Now, the next number will be: 29.
Thus, the correct option is  (C) 29.

Free Tests

Free
Must Attempt

CBT-1 Full Mock Test 1

languageIcon English
  • pdpQsnIcon100 Questions
  • pdpsheetsIcon100 Marks
  • timerIcon90 Mins
languageIcon English
Free
Must Attempt

RRB NTPC Graduate Level PYP (Held on 5 Jun 2025 S1)

languageIcon English
  • pdpQsnIcon100 Questions
  • pdpsheetsIcon100 Marks
  • timerIcon90 Mins
languageIcon English
Free
Must Attempt

CBT-1 General Awareness Section Test 1

languageIcon English
  • pdpQsnIcon40 Questions
  • pdpsheetsIcon30 Marks
  • timerIcon25 Mins
languageIcon English
test-prime-package

Access ‘RRB Group D’ Mock Tests with

  • 60000+ Mocks and Previous Year Papers
  • Unlimited Re-Attempts
  • Personalised Report Card
  • 500% Refund on Final Selection
  • Largest Community
students-icon
354k+ students have already unlocked exclusive benefits with Test Prime!
Our Plans
Monthsup-arrow