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caylus
Hello,

[tex] a_{0}=15 [/tex] first term
[tex] a_{1}=15+r [/tex] second term
[tex] a_{2}=15+2r [/tex]  third term
...
[tex] a_{9}=15+9r [/tex] is the tenth term =69

15+9r=69
==>9r=69-15
==>r=54/9=6
[tex] a_{3}=15+3r=15+18=33 [/tex]






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