what is the missing number in this series 3,14,39,84,155,____.Explain how?

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2 Answers

258

this is the answer
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Series: ............3, 14, 39, 84, 155, 258

1st difference:....11..25..45..71..103

2nd difference:......14..20..26..32 

3rd difference:...........6....6....6 fixed constant

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