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In the given figure, B and C are the cen...

In the given figure, B and C are the centres of the two circles. ADE is the common tangent to the two circles. If the ratio of the radius of both the circles is 3 : 5 and AC = 40, then what is the value of DE?

A

a)`3sqrt(15)`

B

b)`5sqrt(15)`

C

c)`6sqrt(15)`

D

d)`4sqrt(15)`

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