Number Series

1.		In the series: 240, _, 120, 40, 10, 2,... What number should fill in the blank?

120

240

60

480

2.		Find the wrong term in the number series: 2, 5, 10, 17, 26, 37, 50, 64

5

17

37

64

3.		Find the wrong term in the number series: 1, 3, 12, 25, 48, 75, 108

3

12

25

75

4.		In the series: 4, 7, 12, 19, 28, ... What number should come next?

49

36

30

39

5.		In the series: 625, 5, 125, 25, 25, _, 5,... What number should fill in the blank?

5

25

125

2.5

6.		In the series: 3, 7, 23, 95,... What number should come next?

68

256

479

497

7.		In the series: 1, 5, 14, 30, 55, 91,... What number should come next?

132

140

151

162

8.		In the series: 2, 7, 27, 107, 427,... What number should come next?

807

1707

1307

1327

9.		Find the wrong term in the number series: 3, 4, 10, 32, 136, 685, 4116

10

32

685

4116

10.		In the series: 3, 12, 27, 48, 75, 108,... What number should come next?

147

157

183

191