NTA Abhyas JEE Main2020MathematicsDeterminantsPractice
If A = 3 - 2 7 - 5 , then the value of - 3 A 2019 + A 2020 is equal to
Options
- A- 14
- B28
- C14
- D2 2019 ⋅ 14
Correct answer
A. - 14
Step-by-step solution
A = - 15 + 14 = - 1 A 2019 - 3 Ι + A = A 2019 A - 3 Ι = - 1 0 - 2 7 - 8 = - 1 14 = - 1 4