The n^th term of an A.P. is 2n - 5, then the sum of its first 6 term is :

1. 12

2. 15

3. -48

4. -12

A hard card-board is cut in the shape as shown alongside. It is given a full round about its line of symmetry (shown by the dotted line). The solid so formed has :

(i) One cone and one cylinder

(ii) Two cones and one cylinder

(iii) One cone and two cylinders.

Which of the statements given above is true ?

1. only (i)

2. only (ii)

3. only (iii)

4. (ii) and (iii)

For John, the probability of winning a particular game is 0.2. If he played 40 games, how many games did he lose ?

1. 8

2. 16

3. 32

4. 24