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Practice Questions on Series

Q12) What comes in place of '?'
42, 40, 38, 41, 39, 37, 40, ?, ?

1) 38, 35
2) 37, 35
3) 38, 36
4) None of these

Solution:
Pattern used is -2, -2, +3
Required Numbers are = 40 - 2 = 38, 38 - 2 = 36
Hence, option 3.

Q13) What comes in place of '?'
8, 12, 9, 13, 10, 14, 11, ?, ?

1) 15, 18
2) 15, 12
3) 13, 9
4) 9, 13

Solution:
Pattern used is +4, -3.
Required Numbers are = 11 + 4 = 15, 15 - 3 = 12
Hence, option 2.

Q14) What comes in place of '?'
36, 32, 30, 26, 24, 20, 18, ?, ?

1) 14, 12
2) 16, 14
3) 16, 12
4) 14, 16

Solution:
Pattern used is -4, -2.
Required Numbers are = 18 - 4 = 14, 14 - 2 = 12
Hence, option 1.

Q15) What comes in place of '?'
3, 5, 35, 10, 12, 1012, 17, ?, ?

1) 19, 1989
2) 22, 1012
3) 22, 1989
4) 19, 1719

Solution:
This is an alternating addition series, with every third number composed of previous two numbers. Pattern used is +2, +5 and so on.
Required Numbers are = 17 + 2 = 19, 1719 (Composed of 17, 19).
Hence, option 4.

Q16) What comes in place of '?'
13, 29, 15, 26, 17, 23, 19, ?, ?

1) 17, 17
2) 20, 19
3) 21, 20
4) 18, 15

Solution:
The series above is made up of two alternating series 13, 15, 17, 19... and 29, 26, 23...
Hence, option 3.




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