1

### IIT-JEE 1988

Fill in the Blanks
There are four balls of different colours and four boxes of colours, same as those of the balls. The number of ways in which the balls, one each in a box, could be placed such that a ball does not go to a box of its own colour is.......................

9
2

### IIT-JEE 1988

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

35
3

### IIT-JEE 1984

Fill in the Blanks
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 .......................

205
4

### IIT-JEE 1982

Fill in the Blanks
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.....................................

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

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Class 12