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Verified answer
1. 1/322. 1/81
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Un = ar^(n-1)
U9 = 8 × 1/2^(9-1)
= 8 × 1/2^8
= 8 × 1/256
= 8/256
= 1/32
b)
Un = ar^(n-1)
U8 = 27 × 1/3^(8-1)
= 27 × 1/3^7
= 27 × 1/2187
= 27/2187
= 1/81
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