Tentukan rumus suku ke-n untuk
barisan bilangan berikut: 40, 20, 10, 5,....
barisan bilangan berikut: 40, 20, 10, 5,....
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r = 20/ 40 = 1/2
un = ar^(n-1)
un = 40 x 1/2^(n-1)
un = 8 x5 x 2^-1(n-1)
un = 2^3x5 x 2^(-n + 1)
un= 2^3x5 x 2^(1-n)
un = 5 x 2^(4 - n)