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08.11.2020 •
Mathematics
out of all the 59 candidate who sat for examination 35 did physics 35 also did mathematics while 28 also attempted biology. If 18 did both mathematics and physics while 15 did mathematics and biology and 16 did physics and biology. Draw the venn diagram representing the information and find the number of candidate who did all 3 paper
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Ответ:
You say 28 did biology, but then 15 did maths and biology, and 16 did physics and biology
15 + 16 is 31 ??
Ответ:
One way could be to factor each one
A:- = 4x(x - 1)(x - 2)(x + 2)
B:- = 4x ( x + 2)(x - 1) (x - 2)
This shows that the products are the same.