Third member

Determine the third member of the AP if a4=93, d=7.5.

Correct result:

a3 =  85.5

Solution:

a4=93 d=7.5 a3=a4−d=93−7.5=1712=85.5a_{4}=93 \ \\ d=7.5 \ \\ a_{3}=a_{4}-d=93-7.5=\dfrac{ 171 }{ 2 }=85.5

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