If the system of equations 4 x+p y=21 andx- 2 y=15 has unique solution, then which of the followi...

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If the system of equations 4 x+p y=21 andx- 2 y=15 has unique solution, then which of the following could be the value of p ?
(A) 103
(B) 105
(C) 192
(D) 197
(a) Both (A) and (B)
(b) Both (C) and (D)
(c) (A), (B) and (D)
(d) All of (A), (B), (C) and (D)

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