Sum of members

What is the sum of the first two members of the aritmetic progression if d = -4.3 and a3 = 7.5?

Correct result:

s =  27.9


d=4.3 a3=7.5 a2=a3d=7.5(4.3)=595=11.8 a1=a2d=11.8(4.3)=16110=16.1 s=a1+a2=16.1+11.8=27910=27.9

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