A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series. nephew, anther, tenses, prunes, preens, ?
In triangle PQR, the sides PQ and PR are produced to A and B respectively. The bisectors of ∠AQR and ∠BRQ intersect at point O. If ∠QOR = 50°, then what is the value (in degrees) of ∠QPR?