if a²-3a-1=0 and a is not equal to=0 then the value of a²+1/a²will be?
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a²will be?
if a²-3a-1=0 and a is not equal to=0 then the value of a²+1/a²will be?
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Answer:
FORMULA FOR A UNION B UNION C
About "Formula for A union B union C"
Formula for A union B union C :
Here we are going to see the formula for (A U B U C).
n(AUBUC)=n(A)+n(B)+n(C)-n(AnB)-n(BnC)-n(CnA)+n(AnBnC)
Let us look into some example problems based on the above formula.
Example 1 :
For any three sets A, B and C if n(A) = 17, n(B) = 17, n(C) = 17, n(AnB) = 7, n(BnC) = 6 , n(AnC) = 5 and n(AnBnC) = 2, find n(AUBUC).
Solution :
n(AUBUC)=n(A)+n(B)+n(C)-n(AnB)-n(BnC)-n(CnA)+n(AnBnC)
n(AUBUC) = 17 + 17 + 17 - 7 - 6 - 5 + 2
= 35
correct answer
thank you