This is a classic joke question. Only the real ones know the answer.
what is 10+9

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set

The lengths of the two sides of a right triangle are 5 inches and 8 inches what is the difference the possible lengths of the third side of the triangle