Which of the following is NOT a valid video file

What will come in place of the question mark (?) in the following series?

23, 46, ?, 184, 368, 736

Find the common factor of (x² - 4x - 12) and (x² - 14x - 32).

If x, y, z are the three factors of a ³– 7a – 6, then value of x + y + z will be

25, 25.8, 27.4, 29, 33, 37

If, 4x² + y² + 12x + 6y + 18 = 0, then find the value of (2x + y)/(y + 6x).

Solve the inequality for real x:

3 − 2x ≤ (x + 1)/2 < 5

If (x + y) = 35, then find the value of (x - 10)⁶ + (y - 25)⁶.

If (a² + 1/a²) = 51, then find the value of (a³ - 1/a³).