Instructions

What should come in place of question mark (?) in the following number series ?

Question 174

9, 49, 201, 1009, ?, 20209, 80841

Solution

The pattern here followed is :

9 * 5 + 4 = 49

49 * 4 + 5 = 201

201 * 5 + 4 = 1009

1009 * 4 + 5 = 4041

4041 * 5 + 4 = 20209

20209 * 4 + 5 = 80841

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