Question : Directions: In the following question a series is given, with one number missing. select the missing number from the given alternatives.
84, 42, 28, 21, ?
Option 1: 10.5
Option 2: 16.8
Option 3: 18.4
Option 4: 19.6
Correct Answer: 16.8
Solution :
Given:
84, 42, 28, 21, ?
Let's apply the pattern –
84 ÷ (1 + $\frac{1}{1}$) = 42; 42 ÷ (1 + $\frac{1}{2}$) = 28; 28 ÷ (1 + $\frac{1}{3}$) = 21; 21 ÷ (1 + $\frac{1}{4}$) = 16.8
So, 16.8 is the missing term in the series. Hence, the second option is correct.
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