The number which best completes the sequence below is 3 4 6 9 13?

Answer 1

81

Answer 2

According to Wittgenstein's Finite Rule Paradox every finite sequence of numbers can be a described in infinitely many ways and so can be continued any of these ways - some simple, some complicated but all equally valid. Conversely, it is possible to find a rule such that any number of your choice can be the next one.

The simplest solution is based on the following polynomial of order 3

Un = (1*n3 - 9*n2 + 8*n + 246)/2 and, accordingly, the next term would be 93. Note, however, that the sequence continues so this number does not complete the sequence.

Answer 3

The IRS website is obviously a could place to check since they're the ones who make the rules. There's a decent FAQ on IRA that you read here: http://www.irs.gov/retirement/article/0,,id=111413,00.html I also found a decent article on about.com: http://retireplan.about.com/od/iras/a/ira-withdrawal.htm. This should be enough to get you on the right track.

Answer 4

72

difference decreases by 1 each time

9 = 107 - 98

8 = 98 - 90

7 = 90 - 83

6 = 83 - 77

5 = 77 - 72

4 = 72 - 68

3 = 68 - 65

Answer 5

18 18. 3+1=4 4+2=6 6+3=9 9+4=13 13+5=18

Answer 6

93

Answer 7

91

Answer 8

85