Barisan bilangan 2,-4,8,-16,.... mempunyai rumus suku ke-n yaitu
a. un=2n
b. un=-(-2)n
c. un=(-2)b
d. un=2n+1
a. un=2n
b. un=-(-2)n
c. un=(-2)b
d. un=2n+1
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Jawaban:
2 , -4 , 8 , -16 , ...
a = 2
r = -2
Un = ar^n-1 = 2 . (-2)^n-1 = -(-2)^n