Quantitative Aptitude: Number Series Set 72

January 25, 2018January 25, 2018 Shubhra

Directions: The following series are based on a certain pattern. One of the number in series is missing given by ?. Find that number.

1. 1, 2 , 8, ?, 148, 765
   62
   26
   38
   33
   None
   Option D
   Solution:
   1*1 + 1 ²= 2
   2*2 + 2²= 8
   8*3 + 3² = 33
   33*4 + 4² = 148
   148*5 + 5² = 765.
   
2. 48, 42, 54, ?, 61
   47
   52
   45
   42
   None
   Option A
   Solution:
   ……. 48+6=54 ……… 54+7=61
   48…… 42 ……. 54…….. 47……. 61
   ……. 48-6=42 ………. 54-7=47.
   
3. 20, 30, 52, 162, ?, 3222
   644
   462
   554
   675
   None
   Option A
   Solution:
   20*1+10=30
   30*2-8=52
   52*3+6=162
   162*4-4=644
   644*5+2=3222.
   
4. 9, ?, 73, 141, 241, 379
   28
   31
   33
   37
   None
   Option B
   Solution:
   2³ + 1²= 9
   3³ + 2²=31
   4³ + 3²=73
   5³ + 4²=141
   6³ + 5²=241
   7³ + 6²=379.
   
5. 90, 72, ?, 42, 30, 20
   65
   69
   56
   52
   None
   Option C
   Solution:
   10² – 10= 90
   9² – 9= 72
   8² – 8=56
   7² – 7=42
   6² – 6=30
   5² – 5=20.
   
6. 10, 4, 4, 7, ? , 87.25
   18
   20.5
   24.5
   37
   None
   Option B
   Solution:
   10*0.5-1=4
   4*1.5-2=4
   4*2.5-3=7
   7*3.5-4=20.5
   20.5*4.5-5=87.25.
   
7. 3, 4, 8, 17, 33, ?
   44
   54
   46
   58
   None
   Option D
   Solution:
   3+1*1=4
   4+2*2=8
   8+3*3=17
   17+4*4=33
   33+5*5=58.
   
8. 35, 49, ?, 119, 175, 245
   77
   65
   62
   71
   None
   Option A
   Solution:
   34+14=49
   49+28=77
   77+42=119
   119+56=175
   175+70=245.
   
9. 46, 24, 14, 10, 9, ?
   10.5
   9.5
   11
   10
   None
   Option B
   Solution:
   46/2+1=24
   24/2+2=14
   14/2+3=10
   10/2+4=9
   9/2+5=9.5.
   
10. 16, 7, 6, 8, 15, ?
    33
    30.5
    25
    36.5
    None
    Option D
    Solution:
    16*0.5-1=7
    7*1-1=6
    6*1.5-1=8
    8*2-1=15
    15*2.5-1=36.5.
    

 

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