Instructions

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

Question 133

3, 23, 43, ?, 83, 103

Solution

20 is added to each number

3 + 20 = 23

23 + 20 = 43

43 + 20 = 63

63 + 20 = 83

83 + 20 = 103

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