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S12 = 12/2 x (2.1 + (12-1) x 4 )
S12 = 6 x (2 + 11 x 4 )
S12 = 6 x 46 = 276
a=1
b=5-1
b=4
dit S12...?
Sn=n/2 (2.a+(n-1)b)
S12=12/2 (2.1+(12-1)4
S12=12/2 (2+(11)4)
S12=6 (2+44)
S12=6 (46)
S12=276
InsyaAllah Benar. Semoga bermanfaat.