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Verified answer
N = 7n + 5A)
200 = 7(200)+5
200 = 1405
B)
(1+...+100)=7(1+...+100)+5(100)
5050 = 35 350 + 500
100 suku pertama = 35 850
No 3
12(80) + (1+...+11)(15)
= 960 + 66(15)
= 960 + 990
= 1950