Most of the transistors are NPN type and not PNP type because

Most of the transistors are NPN type and not PNP type because 

1.NPN transistor gives large voltage gain 2.NPN transistors are more negative than PNP transistors 3.In NPN transistor, the current conduction is by free electrons which are less mobiles than holes 4.We can have high conduction is NPN transistors 
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Most of the transistors are NPN type and not PNP type because We can have high conduction is NPN transistors 

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