NDA 2015
- Exam
- NDA
- Year
- 2015
- Subject
- Mathematics
- Chapter
- Determinants
NDA 2015 · Mathematics · Determinants
If the value of the determinant | array lll a & 1 & 1 1 & ~b & 1 1...
If the value of the determinant \left|\right| is positive, where , then the value of
Options
- Acannot be less than 1
- Bis greater than -8
- Cis less than -8
- Dmust be greater than 8
Correct answer
B. is greater than -8
Step-by-step solution
\Rightarrow \mathrm{abc} > (\mathrm{a}+\mathrm{b}+\mathrm{c})-2\mathrm{a}=-1 ; \mathrm{b}=0 \ \text{\text{ and } } \mathrm{c}=10 > -2a b c=0\therefore$ After considering all the option; (2) is correct option.