Which of the following is the inverse of the proposition : "If a number is a prime, then it is odd"?

Consider the following statements:

$P:$ Ramu is intelligent.

$Q:$ Ramu is rich.

$R:$ Ramu is not honest.

The negation of the statement "Ramu is intelligent and honest if and only if Ramu is not rich" can be expressed as:

Prove that the sum of three consecutive even numbers is always a multiple of $6$.

Contrapositive of the statement :

'If a function $f$ is differentiable at $a$, then it is also continuous at $a$', is