Is this a abstract classe

I defined a class with 10 functions . It contains declaration of 5
functions and 5 functions are declared and defined. Is this class is
said to a abstract class.

Which one is correct?

If a class contains a virtual class then it is said to a abstract
class.
Or a abstract class always contains a virtual function.
Or neither is true.

Please clarrify me these.

A class containing the pure virtual function is always a abstract
class.

.

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