Application of PNC

Q.

Find the wrong number in the series:
6, 9, 15, 22, 51, 99

1. 99
2. 22
3. 51
4. 15
5. None of the above

Q. 4 5 12 38 160 805 4836

1. 12
2. 160
3. 38
4. 805
5. None of these

Q. 3 7 16 32 56 93 142 ?

1. 32
2. 56
3. 16
4. 7
5. None of these

Q. There are 3 letters and 3 addressed envelopes corresponding to them. The number of ways in which the letters be placed in the envelopes so that no letter is in the right envelope is

1. 3
2. 4
3. 2
4. 5

Q.

A ball was thrown such that the speed of the ball decreases by 5% every second. If the ratio of the final speed to the initial speed is 0.7737, find the time of travel (in seconds)?

1. 1

2. 3

3. 2

4. 4

5. 5