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Home Aptitude Odd Man Out and Series Comments

  • Question
  • Insert the missing number. 7, 26, 63, 124, 215, 342, (....)


  • Options
  • A. 391
  • B. 421
  • C. 481
  • D. 511

  • Correct Answer
  • 511 

    Explanation

    Numbers are (23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1) etc.

    So, the next number is (83 - 1) = (512 - 1) = 511.


  • Odd Man Out and Series problems


    Search Results


    • 1. What is the sum of first 40 terms of 1 + 3 + 4 + 5 + 7 + 7 + 10 + 9 + ....?

    • Options
    • A. 1010
    • B. 1115
    • C. 1030
    • D. 1031
    • Discuss
    • 2. If N = 1 + 11 + 111 + 1111 + ... +111111111, then what is the sum of the digit's of N?

    • Options
    • A. 45
    • B. 18
    • C. 36
    • D. 5
    • Discuss
    • 3. If A = 232, B = 231+ 230+ 229+ ... + 20 and C = 315+ 314+ 313+ ... + 30 , then which of the following option is TRUE?

    • Options
    • A. C > B > A
    • B. C > A > B
    • C. A > B > C
    • D. A > C > B
    • Discuss
    • 4. If A = 1 ? 10 + 3 ? 12 + 5 ? 14 + 7 + ... upto 60 terms, then what is the value of A?

    • Options
    • A. ? 360
    • B. ? 310
    • C. ? 240
    • D. ? 270
    • Discuss
    • 5. Three numbers are in Arithmetic Progression (AP) whose sum is 30 and the product is 910. Then the greatest number in the AP is

    • Options
    • A. 17
    • B. 15
    • C. 13
    • D. 10
    • Discuss
    • 6. Find the odd man out. 41, 43, 47, 53, 61, 71, 73, 81

    • Options
    • A. 41
    • B. 61
    • C. 71
    • D. 81
    • Discuss
    • 7. Insert the missing number. 8, 7, 11, 12, 14, 17, 17, 22, (....)

    • Options
    • A. 20
    • B. 22
    • C. 24
    • D. 27
    • Discuss
    • 8. Find the odd man out? 396, 462, 572, 427, 671, 264.

    • Options
    • A. 671
    • B. 462
    • C. 427
    • D. 264
    • Discuss
    • 9. Find the odd man out. 2, 5, 10, 17, 26, 37, 50, 64

    • Options
    • A. 50
    • B. 37
    • C. 26
    • D. 64
    • Discuss
    • 10. Insert the missing number. 2, 4, 12, 48, 240, (....)

    • Options
    • A. 960
    • B. 1440
    • C. 1080
    • D. 1920
    • Discuss


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