Eric Nicholas K's answer to Anthea Teo's Secondary 2 Maths Singapore question.
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Formula for sum of numbers from 1 to n is 0.5n(n+1)
Formula for sum of numbers from 1 to n-1 is 0.5(n-1)(n-1+1).
Formula for sum of numbers from 1 to n-1 is 0.5(n-1)(n-1+1).
Date Posted:
5 years ago
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