Difference AP 4

Calculate the difference of the AP if a1 = 0.5, a2 + a3 = -1.1

Correct result:

d =  -0.7

Solution:

a1=0.5 a2+a3=−1.1 a2=a1+d a3=a1+2d 2a1+3d=−1.1 d=(−1.1−2⋅ a1)/3=(−1.1−2⋅ 0.5)/3=−710=−0.7

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