Question 1

Paper 1, no calculatorMedium6 marks

A geometric sequence has nth term unu_n where u3=18u_3=18 and u6=486u_6=486

(a)

Determine the first term and the common ratio of the sequence.

[3]
(b)

Hence, write S6S_6 the sum of the first six terms, in sigma notation and determine its value.

[3]

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