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In each of the following questions find ...

In each of the following questions find the missing number from the given responses.
`{:(" 18"," 20"," 8"),("16 20","18 22"," 9 ?"):}`

A

6

B

7

C

10

D

11

Text Solution

Verified by Experts

The correct Answer is:
B
Divide the sum of lower numbers by 2 to get the upper number
First arrangement
`(16+20)/(2)=(36)/(2)=18`
Second arrangement
`(18+22)/(2)=(40)/(2)=20`
third arrangement
`(9+?)/(2) =8`
`rArr9+?=2xx8`
`rArr ?=16-9=7`
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