Determine AP

Determine the difference of the arithmetic progression if a3 = 7, and a4 + a5 = 71

Correct result:

d =  19

Solution:

a3=7 a4+a5=71 a3+d+a3+2d=71 2a3+3d=71 d=(71−2⋅ a3)/3=(71−2⋅ 7)/3=19

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