An expression for the nth triangular number is n(n + 1)/2. Write down the 20th triangular number.

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Complete Pure Mathematics 1 For Cambridge International AS & A Level

ISBN: 9780198427438

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Authors: Jean Linsky, Brian Western, James Nicholson

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An expression for the nth triangular number is n(n + 1)/2. Write down the 20th triangular number.

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answer The 20th triangular number can be fou...View the full answer

Complete Pure Mathematics 1 For Cambridge International AS & A Level

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