1.Which is not correct?

a. Linear equation has the highest power of 1.
b. Quadratic equation has the highest power 3
c. Cubic equation has the highest power of 4

2.If a two-digit number changes its position reciprocally then the number increases by 54. The sum of digits of the two-digit number 12. Find the number.

3.A class of 50 students appeared for an examination of law, Statistics and Accountancy. 25 students failed in law, 24 failed in Statistics, 32 failed in Accountancy, 9 failed in law alone. 6 failed in Statistics alone, 5 failed in Accountancy and Statistics only and 3 failed in law and Statistics only. Find