How many cubes/blocks are there in below figure?

One column with 10 boxes = 1 × 10 = 10
Two column with 7 boxes = 2 × 7 = 14
One column with 4 boxes= 1 × 4 = 4
Total boxes = 28

Total cubes 25

As per the given diagram in above question , we can see that
The central cube of each face will have only one face painted.
Thus, there are <>six such cubes.

As per the given open dice in above question , we can see that
? lies opposite ?.
? lies opposite ?.
? lies opposite ?.

As per the given pattern in question figure , we can find the similar next position of given dice .
Red, Blue, Green and Orange colors are on the faces adjacent to Purple color.
Therefore, yellow color is opposite to purple color.

There are 9 columns with 5 cubes = 9 × 5
There are 7 columns with 4 cubes = 7 × 4
There are 5 columns with 3 cubes = 5 × 3
There are 3 columns with 2 cubes = 3 × 2
There is one column with 1 cubes = 1 × 1
Total = 9 × 5 + 7 × 4 + 5 × 3 + 3 × 2 + 1 × 1 = 81

Number 1 is common to both the figures (i) and (ii). The dice in fig. (ii) is assumed to be rotated so that 1 dot moves to the top face i.e to the same position as in figure (i) and 2 and 4 dots move to the face behind the faces with 3 and 5 dots respectively. Clearly by combination, 3 dots lie on the face opposite the face having 2 dots. Therefore, when there are 2 dots at the bottom, the number of dots at the top will be 3.

as 5 is common on both the figure, and 1,2,4 and 6 are adjacent to 5. hence 3 is opposite of 5.

as per the question, sum of the numbers on opposite sides or faces is always 7. Therefore
1 appears opposite 6,
2 appears opposite 5 and
3 must appears opposite of 4.
In (a) 1 cannot adjacent to 6 In (b) 3 cannot adjacent to 4 In (d) 2 cannot appears adjacent to 5 Hence only option (c) is correct.

For the better understanding take a dice and apply the same steps which is mentioned above.

option (a) is clear from the alternatives.