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1.
385, 462, 572, 396, 427, 671, 264
  • A.
    385
  • C.
    671
  • B.
    427
  • D.
    264
  • Answer & Explanation
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Answer : [B]
Explanation :
 
In each number except 427, the middle digit is the sum of the other two.
 
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2.
6, 13, 18, 25, 30, 37, 40
  • A.
    25
  • C.
    37
  • B.
    30
  • D.
    40
  • Answer & Explanation
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Answer & Explanation : [D]
Explanation :
 
The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
 
So, 40 is wrong.
 
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3.
7, 26, 63, 124, 215, 342, (....)
  • A.
    481
  • C.
    391
  • B.
    511
  • D.
    421
  • Answer & Explanation
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Answer : [B]
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.
 
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4.
445, 221, 109, 46, 25, 11, 4
  • A.
    221
  • C.
    46
  • E.
    11
  • B.
    109
  • D.
    25
  • Answer & Explanation
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Answer : [C]
Explanation :
 
Go on subtracting 3 and dividing the result by 2 to obtain the next number.
 
Clearly, 46 is wrong.
 
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5.
1050, 510, 242, 106, 46, 16, 3
  • A.
    510
  • C.
    106
  • E.
    16
  • B.
    242
  • D.
    46
  • Answer & Explanation
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Answer : [C]
Explanation :
 
2nd term = (1st term - 30)   2 =
 
1050 - 30
2
   = 510;  
 
3rd term = (2nd term - 26)   2 =
 
510 - 26
2
   = 242;  
 
4th term = (3rd term - 22)   2 =
 
242 - 22
2
   = 110.  
 
 
  106 is wrong.  
 
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