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L1 and L2 " are two intersecting lines....

`L_1 and L_2 " are two intersecting lines. If the image of " L_1 " w.r.t. " L_2 " and that of " L_2 " w.r.t. " L_1 " concide, then the angle between " L_1 and L_2` is

A

`20^@`

B

`15^@`

C

`45^@`

D

`60^@`

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The correct Answer is:
B
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