| Directions: What should come in place of the question mark (?) in the following questions? [NICL (AO) 2015] |
| \[{{25}^{3}}\times {{4}^{3}}-{{800}^{2}}={{(?)}^{2}}\] |
A) 360000
B) 60000
C) 3600
D) 6000
E) None of these
Correct Answer: E
Solution :
| \[{{25}^{3}}\times {{4}^{3}}-{{800}^{2}}={{(?)}^{2}}\] |
| \[\Rightarrow \]\[{{(?)}^{2}}=25\times 25\times 25\times 4\times 4\times 4-800\times 800\] |
| \[\Rightarrow \] \[{{(?)}^{2}}=1000000-640000=\sqrt{360000}\] |
| \[\Rightarrow \] \[?=600\] |
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