| Directions: What will come in place of question marks in the given questions? |
| \[{{9}^{2}}\times {{7}^{2}}\div \sqrt{441}-64={{5}^{?}}\] |
A) 4
B) 2
C) 5
D) 3
Correct Answer: D
Solution :
| \[{{9}^{2}}\times {{7}^{2}}\div \sqrt{441}-64={{5}^{?}}\] |
| \[\Rightarrow \]\[81\times 49\div 21-64={{5}^{?}}\] |
| \[\Rightarrow \]\[3969\div 21-64={{5}^{?}}\] |
| \[\Rightarrow \] \[189-64={{5}^{?}}\] |
| \[\Rightarrow \]\[125={{5}^{?}}\]\[\Rightarrow \]\[{{5}^{3}}={{5}^{?}}\] |
| \[\therefore \] \[?=3\] |
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