Well, that WAS my answer for the third one, but I see now that it doesn't work! :)
And I'm not sure what the right answer is. Unless the 4th number is 31 instead of 35. Then I would have an answer. :) But you stumped me with 3, 7, 15, 35!
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Whoops... the pattern should be 3, 7, 15 and 31 instead of 35 as I remember. You've got it right! By the way, we can't take it as an Arithmetic progression. Because the difference is not the same.
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