Question

tn = 2n-5 in a sequence, find its first two terms.​

Answer 1

$\textbf{Given:}$

$\mathsf{t_n=2n-5}$

$\textbf{To find:}$

$\textsf{First two terms of the sequence}$

$\textbf{Solution:}$

$\textsf{Consider,}$

$\mathsf{t_n=2n-5}$

$\mathsf{For\;n=1,}$

$\mathsf{t_1=2(1)-5}$

$\mathsf{t_1=2-5}$

$\implies\boxed{\mathsf{t_1=-3}}$

$\mathsf{For\;n=2,}$

$\mathsf{t_2=2(2)-5}$

$\mathsf{t_2=4-5}$

$\implies\boxed{\mathsf{t_2=-1}}$

$\textbf{Find more:}$

A sequence is given by a_n=n^2-1 nen prove that it is not ap

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