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Nika2504
@Nika2504
July 2021
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Verified answer
N=12
a1=-2
a2=5
d=a2-a1=5-(-2)=5+2=7
S(n)=((2a1+(n-1)d)*n)/2=((-2*2+(12-1)*7)*12)/2=((-4+11*7)*12)/2=438
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Verified answer
N=12a1=-2
a2=5
d=a2-a1=5-(-2)=5+2=7
S(n)=((2a1+(n-1)d)*n)/2=((-2*2+(12-1)*7)*12)/2=((-4+11*7)*12)/2=438