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recursive sequence


look at this interesting sequence :

 a = 2+1 = 3
 b = 2(a)+1 = 7
 c = 2(b)+1 = 15
 d = 2(c)+1 = 31
 e = 2(d)+1 = 63
 f = 2(e)+1 = 127 and so on

the sequence follow this rule 2(n+1)-1

prove it !

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