Complete the following series:
90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3

150

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175

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225

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250

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Solution

The correct option is B 150
Clearly, $90 = 30 \times 3$ , $180 = 6 \times 30$ , $12 = 2 \times 6$ , $50 = 25 \times 2$ , $100 = 4 \times 25$ , $200 = 50 \times 4$ .
So, missing term $= 3 \times 50 = 150$
Hence,option A is the correct answer.

Suggest Corrections

Class interval	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$	$80 - 90$	$90 - 100$
Frequency	$3$	$7$	$12$	$15$	$8$	$3$	$2$

Labour(Units)	Total Product	Average Product	Marginal Product
1 2 3 4 5 6	40 - - 180 - -	- - - - 36 -	- 60 50 - - -18