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I cant think of any quicker way other than to use GP (Geometric progression).
If you look at the sequence, you see the numbers doubling OR we can say that the numbers have a common ratio - in this case '2'. The formula is
nth term = a*(r^n-1). a= first term. r= common ratio and n=nth term
The 20th term will be = 20x2^(20-1) = 20x2^19 = 10485760
Last edited by venksune on 30 Sep 2004, 11:51, edited 1 time in total.
HBS: Reimagining Capitalism: Business and Big Problems : Growing income inequality, poor or declining educational systems, unequal access to affordable health care and the fear of continuing economic distress...