Question

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

Answer 1

`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`