Sattriya is a major dance form of which state?

The period of revolution of a geostationary satellite is:

The pigment which gives colour to the human skin is:

P $+$ Q means P is the daughter of Q, P $-$ Q means P is the wife of Q, P $\times$ Q means P is the sister of Q. P $5$ Q means P is the father of Q and P $=$ Q means P is the brother of Q. Read the above information and answer the question given below it. What does M $-$ N $5$ O mean?