| 84 | 42 | 63 | 157.5 | ? | 2480.625 |
A) 405.65
B) 505.35
C) 541.25
D) 551.25
E) 565.65
Correct Answer: D
Solution :
The series is \[\times \text{0}\text{.5, }\times 1.\text{5, }\times \text{2}\text{.5, }\times \text{3}\text{.5, }\times \text{4}\text{.5, }...\] ie \[\text{84}\times \text{0}\text{.5 = 42, 42}\times \text{1}\text{.5=63,}\] \[\begin{align} & \text{63}\times \text{2}\text{.5=157}\text{.5, 157}\text{.5}\times \text{3}\text{.5=}\mathbf{551}\mathbf{.25}\text{,} \\ & \text{551}\text{.25}\times 4.5=2480.625 \\ \end{align}\]
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