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46. Number series

Find the missing number: 43,63,80,99,120,?

One solution involves incremental addition.

Another solution involves square numbers and subtraction.

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1000
What is ten divided by two?

Comments (4)

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New
namesays...

9*9 is 81... not 89 so the rule is not even consistent

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Admin
IQTLsays...

Corrected, thanks!

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Regular
Julessays...

154

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New
Roseanna Danasays...

143

((12*12)-1)

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New
HUSNAINsays...

143

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