Question 1091784: Insert the missing number 5,11,21,43
a)85 b) 86 c)87 d) 88
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
You can put any number next and it will be a valid sequence. So it is impossible to know if any answer you come up with is "right" in a problem like this.
However, there is a nice pattern in these numbers that suggests a PROBABLE next number:
5 to the next number, 11: double and add 1
11 to the next number, 21: double and subtract 1
21 to the next number, 43: [put your answer here]
43 to the next number, __: [put your answer here]
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