Number Series-Test 6 (Based on two liner series and Finding odd one out)

1)

In each of the following number series, only one number is wrong. Find out the wrong number?

5, 7, 16, 57, 244, 1245, 7506

[Allahabad Bank, 2010]
Discussion
2)

4, 2.5, 3.5, 6.5, 15.5, 41.25, 126.75

[Allahabad Bank, 2010]
Discussion
3)

850, 600, 550, 500, 475, 462.5, 456.25

[Indian Bank (PO), 2010]
Discussion
4)

2, 10, 18, 54, 162, 486, 1458

[Indian Bank (PO), 2010]
Discussion
5)

13, 25, 40, 57, 79, 103, 130

[Indian Bank (PO), 2010]
Discussion

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