Exercise
1.
385, 462, 572, 396, 427, 671, 264
• A.
385
• C.
671
• B.
427
• D.
264
• Report
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
• Report
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
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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
• Report
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
• Report
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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