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PostPosted: Wed Jan 07, 2015 10:45 pm 
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Joined: Fri Sep 19, 2014 4:32 pm
Posts: 190
please help is there any trick to working out this question??


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PostPosted: Wed Jan 07, 2015 10:54 pm 
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Joined: Fri Sep 19, 2014 4:32 pm
Posts: 190
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) =


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PostPosted: Wed Jan 07, 2015 10:59 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
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We've had this before - try searching.


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