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• Look at this series: 7, 10, 8, 11, 9, 12, . . .
What number should come next

• A7
• B10
• C15
• D18
• Explanation:

This is a simple alternating addition and subtraction series.
In the first pattern, 3 is added;
In the second pattern, 2 is subtracted.

Rule =(1st number) (1st number + 3 = 2nd number) (2nd number - 2 = 3rd number) (3rd number + 3 = 4th number)
Now (7) (7 + 3 = 10) (10 - 2 = 8) (8 + 3 = 11) (11 - 2 = 9) (9 + 3 = 12) (12 - 2 = 10)...
So the answer is b = 10.

• 3 13 18 23 28 33
What number should come next

• A38 43
• B37 42
• C38 44
• D39 44
• Explanation:

In this simple addition series, each number is 5 greater than the previous number.

Rule = (1st no) (1st no + 5 = 2nd no) (2nd no + 5 = 3rd no) . . .
Now (3) (3 + 5 = 8) (8 + 5 = 13) (13 + 5 = 18) (18 + 5 = 23) (23 + 5 = 28) (28 + 5 = 33) (33 + 5 = 38) (38 + 5 = 43)
So the answer is c = 38  43

• 18 21 25 18 29 33 18
What numbers should come next

• A43 18
• B41 44
• C37 41
• D38 41
• Explanation:

This is a simple addition series with a random number, 18, interpolated as every third number.
In the series, 4 is added to each number except 18, to arrive at the next number.

• 2, 10, 40, 120,____

• A240
• B360
• C470
• D210
• Explanation:

Here the series is a multiplication series.

The order of the multiplication is ×5, ×4, ×3, ×2

120 × 2 = 240