RRB Government Jobs Exams Category

A farmer has a circular field, radius R metres, in which he has a goat tethered to one edge by a length of chain, L metres long. If the goat is able to graze exactly half of the available area, find an expression for L in terms of R.

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RRB Other Question

A piece of straight, level rail whose length is one mile in winter increases in length by one foot in summer. If the ends were firmly anchored in winter, we are to assume that the rail will become an arc of a circle in summer. How far will the center point move relative to its winter position? An urn contains three white and four black balls. We take out a ball and put it in a drawer without looking at it. After that we take out a second ball. Find the probability that this ball is white.