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If a and b are two positive real numbers such that `4a^2 + b^2 = 20` and ab = 4, then the value of 2a+b is :
यदि a और b दो सकारात्मक वास्तविक संख्याए है जैसे कि `4a^2 + b^2 = 20` और ab = 4, तो 2a+b का मान:

A

80

B

8

C

6

D

5

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