Elitmus Exam Numerical Ability Probability

three dices are thrown what is d probabily to gat atleast one three?

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Elitmus Other Question

two planes belong to mirchi and green .Distance between two cities A and B is 2100km. wind blow from A to B. when races is with the wind mirchi beats green by 300km. when against the wind mirchi beats by 420km .find the ratio of their speeds when no wind blow ?? |a-7|=3,|2b-2|=10 what is the value of b/a