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3 marksNumber Sequences and Rules

CSEC Mathematics · Question 7(a)(iii)

The nth term, T_n, of a sequence is given by T_n = 3n² - 2.

Given that T_n = 145, what is the value of n?

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Other parts of this question

  1. 7(a)(i)Show that the first term of the sequence is 1.[1 mark]
  2. 7(a)(ii)What is the third term of the sequence?[1 mark]
  3. 7(b)(i)Write down the next two terms in the sequence, that is, U(9) and U(10).[2 marks]
  4. 7(b)(ii)Which term in the sequence is the sum of U(18) and U(19)?[1 mark]
  5. 7(b)(iii)Show that U(20) - U(19) = U(19) - U(17).[2 marks]

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