MENSURATION-1

1.M and N are points on PQ and PR such that MN||QR and the ratio of the lengths of QR and MN is n. MR and QN intersect at S. The ratio of the areas of triangle MNS and triangle PQR is?

(a). 1/n

(b). n/(n+1)²

(c). n-1/n³

(d). n-1/n²(n+1)