Problem Solving (PS) | P* is defined as the number of positive even integers less than P, if

HiBunuel ,

For an odd P, P* is defined as the number of positive even integers less than P
For an even P, P* is defined as the number of prime integers less than P.

Since we are asked the value of (5* + 10*)*

5* = 2,4(2)
10* = 2,3,5,7(4)

Therefore we have been asked to find (2+4)* = 6*

But I do not find that answer option. Am i doing something wrong?