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4.) a. rumus suku ke na=105, b=101 1/2 - 105= -3 1/2
un=a+(n-1)b
un=105+(n-1).-3 1/2
un=105-3 1/2n + 3 1/2
un= -3 1/2 n + 108 1/2
b. suku ke berapa jika un = 0
un = -3 1/2n + 108 1/2
0 = -3 1/2n + 108 1/2
3 1/2 n = 108 1/2 - 0
n= 108 1/2 ÷ 3 1/2
n=31