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a. beda deret itu
b. jumlah deret itu
b = y-x/ k-1
21 - 16 / 4+1
5/5 = 1
jumlah
41 = 16 + (n-1) . 1
41-16 = n-1
25 = n- 1
n =16
S26 = 26/2 ( 16 + 21)
13 (37) = hitung sendiri