a triangle and a rectangle are drawn on a page so that they overlap as shown. inside these figures are placed the digits from 0 to 9. if there are six digits in the triangle and eight digits in the rectangle, how many digits are in the part that belongs to both figures

Question

anonymous · Answer

i dnt ge the working out

anonymous · Answer

get*

hartnn · Answer

six digits in the triangle-->Let T =6 
eight digits in the rectangle---->Let R=8
Total = 10 digits. =  T  union R (in other words, T OR R)
get this much ?

anonymous · Answer

how do u get 10 digits?

hartnn · Answer

0 to 9 means total 10 digits
i assumed that the digits are not repeated, which is a fair assumption here...

anonymous · Answer

ohk...no they not repeated

hartnn · Answer

digits are in the part that belongs to "both" figures  = T AND R
(T intersection R) = ...... there is a formula for this, you know ? 
in terms of T,R and T UNION R

anonymous · Answer

but..how do u do year 7 working out..im suposed to draw the diagram and stuff..

hartnn · Answer

'year 7 working out.'  ?? i  didn't get you..

hartnn · Answer

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