Does anybody have any idea about this stuff?

Are the 2 conditions equivalent? Explain why.

a. Not(a<=b)

(a>=b) OR Not (a=b)

b. Not(a<=b)

(a>=b) AND Not (a=b)

Write a condition equivalent to the negation of the given condition, and that does not use the NOT operator.

a. a<b

b. (a>b) And (c<>d)

c. (a=b) Or (a=c)