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Baris ke2 : 22 + (1×5)
Baris ke3 : 22 + (2×5)
•
•
•
Baris ke15 : 22 + (14×5)
Basis ke16 : 22 + (15×5)
Total bangku :
(16×22) + {(1+2+3+...+14+15)×5}
= 352 + (180×5)
= 352 + 900
= 1252
Keterangan:
1+2+3+...+14+15 = 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15
1+2+3+...+14+15 = 1/2 × (1+15) × 15 = 1/2 × 16 × 15 = 8 × 15 = 120
sn=16
a=22
b=5
s16=8 ( 44+15 × 5)
=8 × 119
=952 buah (A)
semoga membantu ;)