In the first two circles, the number inside the circle is written according to a particular relation. Find the number inside the third circle, which follows the series relation as that of the first two circles:

In the first two circles, the number inside the circle is written according to a particular relation. Find the number inside the third circle, which follows the same relation as that of the first two circles?

Find the missing number in the given figure:

Which letter replaces the question mark?

What number should replace the question mark?

What number should replace the question mark?

What should replace the question mark?

$P_{5}QR, P_{4}QS, P_{3}QT, ?, PQV$

What letter should replace the question mark?

Which is the missing section?