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How many words can be formed by using all the letters of the word BIHAR ?

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From horizontal ground a projectile is shot at an initial speed of v=150 m/s and at an angle of 60 degrees after time t=10 s. The projectile explodes and breaks up into two pieces of masses m and 2 m at the moment delta t=10 s. After the explosion the piece of mass m hits the ground at a distance of d=500 m behind the place of shooting in the plane of the trajectory of the unexploded projectile . At this instant how far is the other piece of mass 2 m from the cannon. How many subsets of {1,2,3.....11} contain at least one even integer? A) 1900 B)1964 C)1984 D) 2048