X Y is drawn parallel to the base B C ...

`X Y` is drawn parallel to the base `B C` of ` Delta A B C` cutting `A B` at `X` and `A C` at `Y` . If `A B=4\ B X` and `Y C=2c m` , then `A Y=` (a) `2c m` (b) `4c m` (c) `6c m` (d) `8c m`

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