Q: How many Country have in this World? 

A: 195 Country. 193 Country is member of United Nation. other two non member (The Holy See and the State of Palestine.)

 Q: How many Continents in this world? 

  A: seven continents

A continent is a large continuous mass of land conventionally regarded as a collective region. There are seven continents: Asia, Africa, North America, South America, Antarctica, Europe, and Australia (listed from largest to smallest in size). Sometimes Europe and Asia are considered one continent called Eurasia.