Find the set of values of a if the point...

Find the set of values of a if the points `(1,2)` and `(3,4)` lie to the same side of the straight line `3x-5y+a=0`

A

`[7,11]`

B

`R- [7,11]`

C

`[7,oo]`

D

`[-oo,11]`

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The correct Answer is:

B

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