Question 864090
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Hi
 {{{a[n]=a[1]+(n-1)*d}}}  
 {{{a[n]= 8 +(n-1)*11 = 11n-3}}} 
Arithmetic Sequence: 
 {{{a[n]=a[1]+(n-1)*d}}}  
{{{S[n]=(n(a[1]+a[n]))/2}}}}
{{{S[n]= (n/2)(2*a[1]+ (n-1)d)}}}