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![[Post New]](/templates/default/images/icon_minipost_new.gif) 29 Mar 2008 20:32:43 IST
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here it means that y is greatest..
so the cases can be formed by fixing the value of y and then observing in how many ways the x and z can be selected..
if 2 is fixed at y place then x can be filled by 1 and z can be filled by 0 or 1 ...
x y z
1 2 2 = 2
similarly fixing different nos we see that
2 2 3 = 6
3 3 4 =12
4 4 5 = 20
5 5 6 = 30
6 6 7 = 42
7 7 8 = 56
8 8 9 = 72
adding all these ways we get = 240 -- ans...
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I DONOT FOLLOW THE RULES I MAKE THEM TO FOLLOW ME. |
this reply: 5 points
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