`784 xx sqrt(256) xx 343=4^4 xx 7^?`

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Q 1585645567.     `784 xx sqrt(256) xx 343=4^4 xx 7^?`
RBI 2015
A

`5`

B

`9`

C

`4`

D

`5`

E

none of these

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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