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For triangle ABC,R=5/2 and r=1. Let I be...

For triangle `ABC,R=5/2 and r=1.` Let `I` be the incenter of the triangle and `D,E and F` be the feet of the perpendiculars from `I->BC,CA and AB,` respectively. The value of `(IDxIExIF)/(IAxIBxIC)` is equal to (a) `5/2` (b) `5/4` (c) `10` (d) `1/5`

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