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beda = b = 4
ditanyakan= S12
PENYELESAIAN
Sn = n/2 (2a +(n-1)b)
S12 = 12/2 [(2 x 15) + (12-1)4]
S12 = 6 (30 + (11 x 4)
S12 = 6 (30 + 44)
S12 = 6(74)
S12 = 444
Maka, jumlah semua kurinya adalah 444 buah
B = 4
Dit : Sn 12
Sn = n/2(2a + (n-1) b)
= 12/2(2.15+(12-1).4)
= 6(30+44)
= 6(74)
= 444
Maaf jikalau jawaban saya salah...