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Triangle OAB is such that
OA = a and OB = b. C lies on OB such that OC: CB = 1:1. D lies on AB such that AD: DB=1:1 and E lies on OA such that OA: AE = 3:1. Find:
(a) OC
(b) OD
(c) OE
(d) CD
(e) DE