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In "Number Series" question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces

84 78 72 66 60 54 48
What number should come next ?

Option:
A. 44 34
B. 42 36
C. 42 32
D. 40 34
E. 38 32
Answer: B . 42 36

Justification:

In this simple subtraction series, each number is 6 less than the previous number.

Rule = (1st number) (1st no - 6 = 2nd no.) (2nd no - 6 = 3rd no). . .
Now (84) (84 - 6 = 78) (78 - 6 = 72) (72 - 6 = 66) (66 - 6 = 60) (60 - 6 = 54) (54 - 6 = 48) (48 - 6 = 42) (42 - 6 = 36).
So the answer is b = 42 36

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