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4 votes
If pn= pn-1 +4 and p17=74, then p3=

1 Answer

4 votes

p_n=p_(n-1)+4

\implies p_(17)=p_(16)+4

\implies p_(17)=p_(15)+2\cdot4

\implies p_(17)=p_(14)+3\cdot4

\implies p_(17)=\cdots=p_3+14\cdot4


\implies74=p_3+56\implies p_3=18
answered
User Charlie Davies
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