Question 28 - HABS Maths paper 2014
Moderators: Section Moderators, Forum Moderators
Question 28 - HABS Maths paper 2014
please help is there any trick to working out this question??
Re: Question 28 - HABS Maths paper 2014
We write s(2,5) as an abbreviation for 2+3+4+5 so that s(2,5) = 14
Similarly
S(6,39) = 6+7+8+9+....+ 38 + 39 = 765
Work out:
s(1,3) =
s(6,40) =
s(7, 38) =
s(1,2) - s(2,3) + S (3,4) - s(4,5)+ ......... - S (18,19) + S (19,20) =
Similarly
S(6,39) = 6+7+8+9+....+ 38 + 39 = 765
Work out:
s(1,3) =
s(6,40) =
s(7, 38) =
s(1,2) - s(2,3) + S (3,4) - s(4,5)+ ......... - S (18,19) + S (19,20) =
Re: Question 28 - HABS Maths paper 2014
We've had this before - try searching.