Direction: What should come in place of the question mark (?) in the following question? |
A) 3
B) 11
C) 9
D) 5
E) 7
Correct Answer: D
Solution :
\[784\times \sqrt{256}\times 343={{4}^{4}}\times {{7}^{?}}\] \[\Rightarrow 784\times 16\times 343={{4}^{4}}\times {{7}^{?}}\] \[\Rightarrow {{7}^{?}}=\frac{784\times 16\times 343}{{{4}^{4}}}\] \[=49\times 343\] \[\Rightarrow {{7}^{?}}={{7}^{2}}\times {{7}^{3}}={{7}^{5}}\Rightarrow ?=5\]You need to login to perform this action.
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