Alternative way to open a puzzle box. #shorts

In a crossword puzzle 10 words are to be guessed of which 5 words have each an alternative solution also.No.of possible solutions is

The figure given on the left hand side is folded to form a box. Choose from the alternatives (1), (2), (3) and (4) the boxes that is similar to the box formed.

The total surface area of open cuboidal box is ___________.

Six boys and six girls sit along a line alternately in x ways, and along a circle (again alternatively in ways), then

There are 4 balls and 4 boxes,each of red, blue,greenand yellow colours.The number of ways in which oneball in one box can be put in such a way that no ballis put in box of its colour and the red ball is alwaysin blue box

There are 6 boxes numbered 1, 2, ... 6. Each box is to be filled up either with a red or a green ball in such a way that at least 1 box contains a green ball and the boxes containing green balls are consecutively numbered. The total number of ways in which this can be done is

Determine the missing value in the puzzle below :

There are four balls of different colors and four boxes of colors same as those of the balls. Find the number of ways in which the balls, one in each box, could be placed in such a way that a ball does not go to box of its own color.