17. In a parallelogram PQRS, ∠P + ∠Q = a⁰ and ∠P - ∠R = b⁰. Then, a and b are respectively. (a) 90°, 90°
(b) 120°, 60°
(c) 180°, 0°
(d) 180°, 90°
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17. In a parallelogram PQRS, ∠P + ∠Q = a⁰ and ∠P - ∠R = b⁰. Then, a and b are respectively. (a) 90°, 90°
(b) 120°, 60°
(c) 180°, 0°
(d) 180°, 90°
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