Question

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Answer 1

\[a_2=2\times a_1-5=2\times 6-5=12-5=7\]
\[a_3=2\times 7-5=9\] ect

Answer 2

or etc as the case may be

Answer 3

When n=2, a2=2a1-5=12-5=7
Similarly a3=9 and a4=13