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If the A.M. and G.M. of two positive numbers are 10 and 8, the numbers are:

A2 and 18
B4 and 16
C6 and 14
D5 and 15
Answer & Solution
Correct answer: B. 4 and 16
a+b = 20, ab = 64; roots of x²−20x+64=0 are 4 and 16.
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