AC Lim's answer to J's Secondary 2 Maths Singapore question.

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AC Lim
Ac Lim's answer
12513 answers (A Helpful Person)
Hope this helps
J
J
2 years ago
Alternative for the second part : (since it's a 'hence' question you'll need to use the previous result)


25 + 30 + 35 + ... + 115 + ... + 35 + 30 + 25

= 5 (5 + 6 + 7 + ... + 23 + ... + 7 + 6 + 5)

= 5 (509)

= 2545
AC Lim
AC Lim
2 years ago
@j... Yes. This should be the working! Thanks for figure it out :)