| Directions: What approximate value will come in place of question mark (?) in the given questions? (You are not expected to calculate exact value.) [IBPS (SO) IT 2015] |
| \[({{41.99}^{2}}-{{18.04}^{2}})-?={{13.11}^{2}}-138.99\] |
A) 4004
B) 1200
C) 1720
D) 8432
E) 1410
Correct Answer: E
Solution :
| \[({{41.99}^{2}}-{{18.04}^{2}})-?={{13.11}^{2}}-138.99\] |
| \[\Rightarrow \] \[({{42}^{2}}-{{18}^{2}})-?={{(13)}^{2}}-139\] |
| \[\Rightarrow \] \[\{(42+18)(42-18)\}-?=169-139\] |
| \[\Rightarrow \] \[(60\times 24)-?=30\] |
| \[\Rightarrow \] \[1440-?=30\] |
| \[\Rightarrow \] \[?=1410\] |
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