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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
b = ( 41 - 16 ) / ( 4 + 1 ) = 25 /5 = 5
maka beda = 5
n = ( k + 2 ) = 4 + 2 = 6 .
Sn = n/2 x ( U1 + Un )
= 6 / 2 x ( 41 + 16 )
= 3 x 57 = 171 ...
Ini jawaban ane gan :)