cessy15 cessy15

08-06-2016
Mathematics

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Find the first 5 terms of the sequence: an = 4n-1.

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09-06-2016

#sol1

a1=1×4-1=3
a2=2×4-1=7
a3=3×4-1=11
a4=4×4-1=15
a5=5×5-1=19

#sol2

f(1)=1×4-1=3,
f(n+1)=f(n)+4,
so .... you know.

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