An expression for the nth triangular number is n(n + 1)/2. Write down the 20th triangular number.
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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
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Related Book For 
Complete Pure Mathematics 1 For Cambridge International AS & A Level
ISBN: 9780198427438
2nd Edition
Authors: Jean Linsky, Brian Western, James Nicholson
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