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WAEC Mathematics 2018 Paper

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Question : 25

Total: 50

Find the

n^{th}

term of the sequence 2 x 3, 4 x 6, 8 x 9, 16 x 12...

2 $^n$ x 3(n + 1)
2 $^n$ x 3n
2 $^n$ x 3 $^n$
2 $^n$ x 3 $^n - 1$

Solution:

2 x 3, 4 x 6, 8 x 9, 16 x 12,...

2 $^1$ x 3 x 1, 2 $^2$ x 3 x 2, 2 $^3$ x 3 x 3, 2 $^4$ x 3 x 4,.... 2 $^n$ x 3n

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