13
15
17
26
Correct answer is A
f(x)=p+qx
f(1)=p+q(1)⟹p+q=7....(1)
f(5)=p+5q=19.....(2)
Solving for p and q using simultaneous equation, p = 4, q = 3
f(3)=4+3(3)=13
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