Nth term of an arithmetic sequence is given by "(a+(n-1)d" )
then "T_1=5" which means a=5
we are given 8th term as 19
"T_8=19\\\\5+7d=19\\\\d=2"
We have to find 100th term
"T_{100}=a+(n-1)d=5+99\\times2=203"
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