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The average of a, b and c is 9. The aver...

The average of a, b and c is 9. The average of b and c is 10. What is the value of a?
a, b तथा c का औसत 9 है | b तथा c का औसत 10 है | a का मान कितना है ?

A

6

B

7

C

8

D

9

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