AC Lim's answer to Amanda's Secondary 1 Maths Singapore question.
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Hope this helps
Date Posted:
4 years ago
For b) why divide by 2?
1＋2＋3 = 6 = 3(3＋1)÷2 = 6
1＋2＋3＋4 = 10 = 4(4＋1)÷2 =10
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÷2 is term for sum of 1+2+3+4+5+.....+n.
1＋2＋3＋4 = 10 = 4(4＋1)÷2 =10
.
.
.
.
÷2 is term for sum of 1+2+3+4+5+.....+n.
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