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Home ‣ Aptitude ‣ Sequential Output Tracing Comments
  • Question

  • The first term in a sequence is 1 and the second term is 5. From the third term on each term is the average (arithmetic mean) of all preceding terms. What is the 25th term in the sequence?


  • Options
  • A. 2.5
  • B. 3
  • C. 5
  • D. 2.5

  • Correct Answer
  • 3 

    Explanation

    Start constructing the sequence until you see the pattern

    1...5...(average of 1 and 5 = 3)...(average of 1, 5, and 3 = 3)...(average of 1,5,3 and 3 = 3)

    now you can see that all subsequent terms will be 3

    • Tags: GRE

    Sequential Output Tracing problems

    Search Results

    • 1. An electronic device rearranges numbers step-by-step in a particular order according to set of rules. The device stops when the final result is obtained. Input: 84 15 35 04 18 96 62 08 Step 1: 96 84 15 35 04 18 62 08 Step 2: 96 84 62 15 35 04 18 08 Step 3: 96 84 62 35 15 04 18 08 Step 4: 96 84 62 35 18 15 04 08 Step 5: 96 84 62 35 18 15 08 04 And Step 5 is the last step for this input. Now, find out an appropriate step in the following question following the above rule. Question: Input: 16 09 24 28 15 04 What will be the third step for this input ?

    • Options
    • A. 28 24 15 16 04 09
    • B. 28 24 16 15 09 04
    • C. 24 28 15 16 09 04
    • D. 28 24 16 15 04 09
      • Discuss
    • 2. A word arranging device rearranges words step-by-step in a particular order according to set of rules. The device stops when the final result is obtained. Input: but going for crept te light sir Step 1: crept but going for te light sir Step 2: crept going light but for te sir Step 3: crept going light but for sir te And Step 3 is the last step for this input. Now, find out an appropriate step in the following question following the above rules. Question: Input: more fight cats cough sough acts idea What will be the last step for this input ?

    • Options
    • A. cough fight sough acts cats idea more
    • B. cough fight sough acts cats more idea
    • C. cough more fight sough acts idea cats
    • D. none of these
      • Discuss
    • 3. -20 , -16 , -12 , -8 .... In the sequence above, each term after the first is 4 greater than the preceding term. Which of the following could not be a term in the sequence?

    • Options
    • A. 220
    • B. 440
    • C. 668
    • D. 762
      • Discuss
    • 4. A word arrangement machine, When given an input line of words, rearranges it in every step following a certain rule. Following is an illustration of an input line of words and various steps of rearrangement. Input: gone are take enough brought station Step 1: take gone are enough brought station Step 2: take are gone enough brought station Step 3: take are station gone enough brought Step 4: take are station brought gone enough And Step 4 is the last step for this input. Now, find out an appropriate step in the following question following the above rule. Question: Input: car on star quick demand fat What will be the third step for this input ?

    • Options
    • A. star car demand quick on fat
    • B. star quick car demand on fat
    • C. star car quick demand on fat
    • D. none of these
      • Discuss
    • 5. An electronic device when fed with the numbers, rearranges them in a particular order following certain rules. The following is a step-by-step process of rearrangement for the given input of numbers. Input :- 85 16 36 04 19 97 63 09 Step I :- 97 85 16 36 04 19 63 09 Step II :- 97 85 63 16 36 04 19 09 Step III :- 97 85 63 36 16 04 19 09 Step IV :- 97 85 63 36 19 16 04 09 Step V :- 97 85 63 36 19 16 09 04 (for the given input step V is the last step). Which of the following will be the last step for the given input ? Input :- 03 31 43 22 11 09

    • Options
    • A. IV
    • B. V
    • C. VI
    • D. None of these
      • Discuss
    • 6. Six family members Pankaj, Gopi, Chetan, Dinesh, Akash and Vyom are standing around a circular table. Gopi is between Vyom and Chetan. Pankaj is between Akash and Dinesh. Vyom is to the immediate right of Dinesh. Who is opposite to Dinesh?

    • Options
    • A. Pankaj
    • B. Chetan
    • C. Vyom
    • D. Gopi
      • Discuss
    • 7. From the given alternatives, select the word which CANNOT be formed using the letters of the given word. Threatened

    • Options
    • A. Heart
    • B. Detain
    • C. Treat
    • D. Heated
      • Discuss
    • 8. Arrange the following words as per order in the dictionary 1. Assassination 2. Association 3. Assimilate 4. Assimuthual

    • Options
    • A. 1,2,3,4
    • B. 1,3,2,4
    • C. 1,3,4,2
    • D. 2,3,1,4
      • Discuss
    • 9. There are five girls - R, S, T, P and Q sitting in a row facing north. T is sitting exactly in the middle of the row. Q is sitting to the immediate right and immediate left of P and T respectively. S is not sitting at the extreme end. Who is sitting third to the left of R?

    • Options
    • A. P
    • B. Q
    • C. S
    • D. T
      • Discuss
    • 10. In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word. CALCULATING

    • Options
    • A. GAIN
    • B. TANING
    • C. TAIL
    • D. CULT
      • Discuss

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