tentukan K jika diketahui deret aritmatika  2+4+6+....+k=930

a+(n-1)b=930
2+(n+1)2=930
2+2n+2=930
4+2n=930
2n=930-4
2n=926
n=926/2
n=463
  
 n'=(n-1)k+n
 463=(930-1)k+930
 463=930k-k+930
 463-930= 929k
 -467=929k
 -467/929=k
k=0,5