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E and F are points on the sides PQ and PR respectively of a $\triangle PQR$. If EF $||$ QR and PE = $4$ cm, QE = $3$ cm and EF = $4$ cm, then the length of QR is :
- (a)$3$ cm
- (b)$4$ cm
- (c)$7$ cm
- (d)$6$ cm
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Ans. (c) $7$ cm