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10 December, 21:22

What is the 20th term of the sequence that begins - 2,4,-8,16

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  1. 10 December, 21:31
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    Upon keenly observing the given above, we can say that the set of numbers is a geometric sequence with first term (a1) equal to - 2 and common ratio (r) equal to - 2. The 20th term of this sequence is

    a20 = (-2) x (-2) ^ (20 - 1) = 1048576
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