Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

How can you leave a room with two legs and return with six legs?

Who has married many women but was never married?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Solve the counting riddle by identifying the number of triangles in the given picture.

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98