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In the quadratic equation x^2 + ax + b=0...

In the quadratic equation `x^2 + ax + b=0`, a and b can take any value from the set {1, 2, 3, 4}. How many pairs of values of a and b are possible in order that the quadratic equation has real roots ?

A

6

B

7

C

8

D

16

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The correct Answer is:
B
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