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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
=
=
= 5
Un = a+ (n-1)b
41 = 16 + 5n -5
41 = 11+ 5n
30 = 5n
6 = n
jumlah seluruh deret
S6 = n (2a +(n-1)b)
= x 6 (2 x 16 + 25)
= 3 x 57
=171