March 24, 2017

Number Series - Quantitative Aptitude for IBPS & SBI PO exams #18

Number Series - Quantitative Aptitude for IBPS & SBI PO, IBPS & SBI Clerk, LIC, RBI, RRB, IPPB, UPSC, SSC CGL and other exams

Directions: What comes in place of "?"
  1. 550, 1300, 2800, 5050, 8050, ?
    1. 15400
    2. 15800
    3. 15600
    4. 15200
  2. 25987.5, 4725, 1050, 300, 120, ?
    1. 100
    2. 60
    3. 40
    4. 80
  3. 8192, 2048, 512, 128, 32, ?
    1. 12
    2. 8
    3. 4
    4. 2
  4. 6, 31, 126, 381, 766, ?
    1. 771
    2. 773
    3. 775
    4. 777
  5. 2, 20, 62, 136, 250, ?
    1. 404
    2. 408
    3. 412
    4. 416
  6. 46, 47, 55, ?, 146, 271
    1. 62
    2. 72
    3. 42
    4. 82
  7. 18, 20, 21, 22, 24, ?
    1. 25
    2. 26
    3. 27
    4. 28
  8. 15, 16, 20, ?, 45, 70
    1. 23
    2. 26
    3. 29
    4. 31
  9. 4, 8, 7, 12, ?, 17
    1. 10
    2. 15
    3. 11
    4. 12
    Number Series - Quantitative Aptitude for IBPS & SBI PO exams
  10. 5, 8, 13, ?, 29, 40
    1. 18
    2. 20
    3. 25
    4. 22
  11. -2, 0, 11, 58, ?, 1016
    1. 200
    2. 223
    3. 246
    4. 249
  12. 20, 36, 48, 56, 60, ?
    1. 62
    2. 60
    3. 64
    4. 66
  13. 513, 345, 219, ?, 59, 21
    1. 109
    2. 119
    3. 129
    4. 139
  14. 49, 46, 40, 31, 19, ?
    1. 6
    2. 4
    3. 2
    4. 0
  15. 1, 6, 31, ?, 781, 3906
    1. 156
    2. 154
    3. 152
    4. 150

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Answers

  1. 11800+750*1, +750*2,......, +750*5 →8050+750*5 = 11800
  2. 80/5.5, /4.5, /3.5, /2.5, /1.5 → 120/1.5 = 80
    If you find it difficult to divide, let's come from the right hand side
    Which means *2.5, *3.5, *4.5, *5.5, so we can say ? * 1.5 = 120 = 80
  3. 8
    /4, /4, /4......→ 32/4 = 8
  4. 771
    *6+0, *5+1, *4+2, ....., *1+5 → 766*1+5=771
  5. 412
    This follows two sets
    20-2=18, 62-20=42, 136-62=74, 250-136=114 ......(1)
    42-18=24, 74-42=32, 114-74=40 ............(2)
    24, 32, 40 are multiples of 8, next comes 48, 56, 64....
    therefore 114+48=162 then, 162+250= 412
  6. 82
    +1^3, +2^3, +3^3, +4^3, +5^3
  7. 25
    in the given series 19 and 23 are missing which are prime numbers, so the next term will be 25 which is not a prime number.
  8. 29
    +1², +2², +3², +4², +5²
  9. 11
    +4, -1, +5, -1, +6
  10. 20
    +3, +5, +7, +9, +11
  11. 249
    4^0-3, 4^1-4, 4^2-5, 4^3-6, 4^4-7, 4^5-8
  12. 60
    +4*4, +4*3, +4*2, +4*1, +4*0
  13. 129
    8^3+1, 7^3+2, 6^3+3, 5^3+4, 4^3+5, 3^3+6
  14. 4
    -3, -6, -9, -12, -15
  15. 156
    *5+1, *5+1, *5+1, *5+1, *5+1

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