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Find the first $5$ terms of the series given by $a_1=a_2=2,\:a_n=a_{n-1}-1\:\:for\:\:n>2$

$\begin{array}{1 1}2,2,0,-1,-2 \\2,2,-1,0,1 \\ 2,2,1,-1,-2 \\ 2,2,1,0,-1\end{array} $

1 Answer

Given: $a_1=a_2=2\:\:and\:\:a_n=a_{n-1}-1$
By putting $n=3,4... $ we get the first 5 terms as
$a_3=a_2-1=2-1=1$
$a_4=a_3-1=1-1=0$
$a_5=a_4-1=0-1=-1$
answered Feb 18, 2014 by rvidyagovindarajan_1
 

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