hamburger menu
All Coursesall course arrow
adda247
reward-icon
adda247
    arrow
    arrow
    arrow
    Select the number from among the given options that can replace the question mark(?) in the following series.1, 2, 5, 26, 677, ?
    Question

    Select the number from among the given options that can replace the question mark(?) in the following series.
    1, 2, 5, 26, 677, ?

    A.

    3255

    B.

    45245

    C.

    24563

    D.

    458330

    Correct option is D

    Given: 1, 2, 5, 26, 677, ?
    Logic: Each number is squared and 1 is added to get next number.
    12+1=1+1=2
    22+1=4+1=5
    52+1=25+1=26
    262+1=676+1=677
    6772+1 = 458329+1 = 458330
    So, missing number = 458330
    Thus, option D is correct.

    Free Tests

    Free
    Must Attempt

    SSC GD PYP (Held on 4 Feb 2025 S1)

    languageIcon English
    • pdpQsnIcon80 Questions
    • pdpsheetsIcon160 Marks
    • timerIcon60 Mins
    languageIcon English
    Free
    Must Attempt

    Hindi Section Test 1

    languageIcon English
    • pdpQsnIcon20 Questions
    • pdpsheetsIcon40 Marks
    • timerIcon12 Mins
    languageIcon English
    Free
    Must Attempt

    SSC GD Constable Full Mock Test 1

    languageIcon English
    • pdpQsnIcon80 Questions
    • pdpsheetsIcon160 Marks
    • timerIcon60 Mins
    languageIcon English
    test-prime-package

    Access ‘Delhi Police Constable’ 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