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9 April, 11:13

11/28 Marks

Write down in terms of n, an expression for the nth term

of the following sequences:

a) 12

10

8

6

4

+5
Answers (1)
  1. 9 April, 12:34
    0
    14 - 2n

    Step-by-step explanation:

    a = first term = 12

    d = second term - first term = 8 - 10 = - 2

    nth term = a + (n-1) d

    = 12 + (n-1) * (-2)

    = 12 + n * (-2) - 1 * (-2)

    = 12 - 2n + 2

    = 14 - 2n
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