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Find out what should come in place of the question mark in the following number series - 4, 9, 19, 34, ?

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posted May 3, 2017 by Navya

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4 + 5 = 9
9 + 10 = 19
19 + 15 = 34
34 + 20 = 54

answer May 3, 2017 by Tejas Naik

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