Look at this series: 4, 9, 19, 39, 79,... What number should come next?
The pattern is
4*2+1=9
9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159
Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
In this simple subtraction series, each number decreases by 0.4.
Look at this series: 2, 6, 18, 54, ... What number should come next?
2*3 = 6
6*3 = 18
18*3 = 54
54*3 = 162
Look at this series: 2, 4, 6, 8, 10, ... What number should come next?
Each number increases by 2.
Like 
First number is 2
Second number = 2 + 2 =4
Third number = 4 + 2 = 6
Fourth number = 6 + 2 = 8
Fifth number = 8 + 2 = 10 and
Sixth number = 10 + 2 = 12
Hence, The answer is (b) 12.
Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
In this simple addition series, each number increases by 0.8.
Next number will be 4.7
Look at this series: 201, 202, 204, 207, ... What number should come next?
In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?
The series is 14, 28, 20, 40, 32, 64
Take three terms at a time. The notation be as follows:
Let, First term = a = 14
It is evident that Second term= 2*a = 2 * 14 = 28 and,
The Third term = Second term  8 OR ( 2*a  8 ) = 28  8 = 20
Now consider the third, fourth and the fifth term.
Let, Third term = a = 20
It is evident that Fourth term= 2*a = 2 * 20 = 40 and,
The Fifth term = Second term  8 OR ( 2*a  8 ) = 40  8 = 32
Similarly consider fifth, sixth and the seventh(term to be found).
Let, Fifth term = a = 32
It is evident that Sixth term = 2*a = 2 * 32 = 64 and,
The Seventh term ( term to calculated) = Second term  8 OR ( 2*a  8 ) = 64  8 = 56
Look at this series: 544, 509, 474, 439, ... What number should come next?
This is a simple subtraction series.
Each number is 35 less than the previous number.
(544  35 = 509) (509  35 = 474) (474  35 = 439) (439  35 = 404)...
Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
8 x 1  2 = 6
6 x 2  3 = 9
9 x 3  4 = 23
23 x 4  5 = 87
87 x 5  6 = 429
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