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

2 / √5, 3 / 5, 4 / 5√5, 5 / 25,(.....)

Option:
A. 6 / 5?5
B. 6 / 25?5
C. 6 / 125
D. 7 / 25
Answer: B . 6 / 25?5

Justification:

Clearly, the numerators of the given fraction are consecutive natural numbers.
So, the numerator of the missing fraction should be 6.
Also, the denominator of each fraction is multiplied by

√5 to obtain the denominator of the next fraction.
So, the denominator of the missing fraction should be 25
√5.

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