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If 4 xx 9 xx 3= 4 and 5 xx 3 xx 1=3, the...

If `4 xx 9 xx 3= 4 and 5 xx 3 xx 1=3`, then
`9 xx 9 xx 7=?`

A

5

B

6

C

7

D

9

Text Solution

Verified by Experts

The correct Answer is:
A
`4 xx 9 xx 3 = 4`
`rArr sqrt(4 + 9+3) =4`
`rArr sqrt16 = 4`
`5 xx 3 xx 1= 3`
`rArr sqrt(5+3+1) =3`
`rArr sqrt9= 3`
Therefore, `9 xx 9 xx 7 = ?`
`rArr ? = sqrt(9 + 9 + 7)`
`rArr ? = sqrt25 = 5`
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