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A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
4, 13.5, 62.5, 171.5, ? , 1098.5
4, 13.5, 62.5, 171.5, ? , 1098.5
- A660
- B665.5
- C665
- D664.5
Answer not set
Discussion 1
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CCommunity
Given series:$
4, 13.5, 62.5, 171.5, ? , 1098.5$
Number in a series is half of cube of prime numbers starting from 1,$
23 = 8 = 8/2 = 4$
33 = 27 = 27/2 = 13.5$
53 = 125 = 125/2 = 62.5$
73 = 343 = 343/2 = 171.5$
113 = 1331 = 1331/2 = 665.5$
133 = 2197 = 2197/2 = 1098.5$
Thus, answer is 665.5.$
4, 13.5, 62.5, 171.5, ? , 1098.5$
Number in a series is half of cube of prime numbers starting from 1,$
23 = 8 = 8/2 = 4$
33 = 27 = 27/2 = 13.5$
53 = 125 = 125/2 = 62.5$
73 = 343 = 343/2 = 171.5$
113 = 1331 = 1331/2 = 665.5$
133 = 2197 = 2197/2 = 1098.5$
Thus, answer is 665.5.$