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# If the points $(1,2)$ and $(3,4)$ lie on the same side of the straight line $3x-5y+a=0$ then a lies in the set

$(a)\;[7,11] \quad (b)\;R-[7,11] \quad (c)\;[7,\infty] \quad (d)\;(- \infty,11]$

(b) R- [7,11]