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1

IIT-JEE 1988

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Total number of ways in which six ' + ' and four ' - ' signs can be arranged in a line such that no two ' - ' signs occur together is.....................................

Answer

35
2

IIT-JEE 1984

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The side AB, BC and CA of a triangle ABC have 3, 4 and 5 interior points respectively on them. The number of triangles that can be constructed using these interior points as vertices is .......................

Answer

205
3

IIT-JEE 1982

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In a certain test, $${a_i}$$ students gave wrong answers to atleast i questions, where i = 1, 2,..., k. No student gave more than k wrong answers. The total number of wrong answers given is.....................................

Answer

$${a_1} + {a_2} + ...... + {a_k}$$

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