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If (7xx8)/(9)=3,(8xx9)/(144)=12,(10xx11)...

If `(7xx8)/(9)=3,(8xx9)/(144)=12,(10xx11)/(169)=13`, then `(12xx13)/(441)=?`

A

196

B

225

C

144

D

21

Text Solution

Verified by Experts

The correct Answer is:
D
`(7xx8)/(9)=3`
`rArrsqrt(9)=3`
`(8xx9)/(144)=12`
`rArr sqrt(144)=12`
`(10xx11)/(169)=13`
`rArr sqrt(169)=13`
Therefore,
`(12xx13)/(441)rArrsqrt(441)=21`
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