Question 1154642
Seven differences to go from 41 to 20.

{{{20-41=-21}}}


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{{{-21/7=-3}}}

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If term #1 is {{{A[1]}}}, then   {{{A[1]+(-3)(5-1)=41}}}.

Find this term #1, {{{A[1]}}}.
Use that to answer your exercise's question.