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How many triangles can be made by using 87 match sticks such that the triangles are equilateral of unit length (that of match stick length) in this manner /_/_/_..

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for 1st triangle 3 sticks r required.then add 2 sticks every time with the previously made 1st triangle.
so,87-3(for 1st triangle)=84 then 84/2=42...........ans is 42+1=43
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ans is 87/3=29
9 years agoHelpfull: Yes(1) No(3)
Make a squire and put a digonal in it that comprises two triangle and next adjasent require 4 sticks giving 2 triangle

In this way total triangle= 52
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answer is 43
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TCS Other Question

A,B,C can do a piece of work in 36 days A,B together are twice as efficient as C. A,C together are thrice as efficient as B. In how many days c alone can do that work. Set A {1,3,10,17,19}, B{9,12,15,18,21} and set C{4,7,10,13,16,19} probability of a num from A+ a num from B > a num from C. (not sure about numbers)(it is a star mark qn)