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The length of an elastic string is a met...

The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is

A

4a - 5b

B

5b - 4a

C

9b - 9a

D

a + b

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The correct Answer is:
B
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