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Find the missing number- 17; 31; 65; 127; 257; ?

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Find the missing number- 17; 31; 65; 127; 257; ?
posted Dec 2 by Rajni
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1 Answer

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511


17
17*2-3
31*2+3
65*2-3
127*2+3
257*2-3=511

answer Dec 2 by Hanifa Mammadov

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