hamburger menu
All Coursesall course arrow
adda247
reward-icon
adda247
    arrow
    arrow
    arrow
    Select the number that can replace the question mark (?) in the following series.7, 12, (?), 37, 57
    Question

    Select the number that can replace the question mark (?) in the following series.

    7, 12, (?), 37, 57

    A.

    17

    B.

    27

    C.

    19

    D.

    22

    Correct option is D

    Given series.
    7, 12, (?), 37, 57
    Following the logic is: increasing pattern like:
    5,10,15,205, 10, 15, 205,10,15,20 (increments by 5)
    7 + 5 \rightarrow 12
    12 + 10 \rightarrow​ 22
    22 + 15 \rightarrow 37
    37 + 20 \rightarrow 57
    Thus the correct answer is:  Option D

    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

    RRB NTPC UG Level PYP (Held on 7 Aug 2025 S1)

    languageIcon English
    • pdpQsnIcon100 Questions
    • pdpsheetsIcon100 Marks
    • timerIcon90 Mins
    languageIcon English
    test-prime-package

    Access ‘RRB NTPC’ Mock Tests with

    • 60000+ Mocks and Previous Year Papers
    • Unlimited Re-Attempts
    • Personalised Report Card
    • 500% Refund on Final Selection
    • Largest Community
    students-icon
    368k+ students have already unlocked exclusive benefits with Test Prime!
    Our Plans
    Monthsup-arrow