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Let a relation R be defined by relation The `R = {(4, 5), (1,4), (4, 6), (7, 6), (3,7)}` `R^(-1)oR` is given by

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To solve the problem, we need to find \( R^{-1} \) (the inverse of the relation \( R \)) and then compute \( R^{-1} \circ R \) (the composition of \( R^{-1} \) and \( R \)). ### Step 1: Find the inverse relation \( R^{-1} \) The inverse of a relation \( R \) is obtained by swapping the elements in each ordered pair. Given: \[ R = \{(4, 5), (1, 4), (4, 6), (7, 6), (3, 7)\} \] The inverse relation \( R^{-1} \) will be: \[ R^{-1} = \{(5, 4), (4, 1), (6, 4), (6, 7), (7, 3)\} \] ### Step 2: Compute the composition \( R^{-1} \circ R \) The composition of two relations \( A \) and \( B \), denoted \( A \circ B \), consists of all pairs \( (a, c) \) such that there exists an element \( b \) where \( (a, b) \in B \) and \( (b, c) \in A \). Now we will find \( R^{-1} \circ R \): 1. For each pair \( (x, y) \) in \( R \), we will look for pairs \( (y, z) \) in \( R^{-1} \). 2. If such a pair exists, we will form the new pair \( (x, z) \). Let's go through each pair in \( R \): - For \( (4, 5) \) in \( R \): - Look for \( (5, z) \) in \( R^{-1} \): \( (5, 4) \) gives \( (4, 4) \). - For \( (1, 4) \) in \( R \): - Look for \( (4, z) \) in \( R^{-1} \): \( (4, 1) \) gives \( (1, 1) \). - For \( (4, 6) \) in \( R \): - Look for \( (6, z) \) in \( R^{-1} \): \( (6, 4) \) gives \( (4, 4) \) and \( (6, 7) \) gives \( (4, 7) \). - For \( (7, 6) \) in \( R \): - Look for \( (6, z) \) in \( R^{-1} \): \( (6, 4) \) gives \( (7, 4) \) and \( (6, 7) \) gives \( (7, 7) \). - For \( (3, 7) \) in \( R \): - Look for \( (7, z) \) in \( R^{-1} \): \( (7, 3) \) gives \( (3, 3) \). Now, compiling all the pairs we found: - From \( (4, 5) \): \( (4, 4) \) - From \( (1, 4) \): \( (1, 1) \) - From \( (4, 6) \): \( (4, 4) \) and \( (4, 7) \) - From \( (7, 6) \): \( (7, 4) \) and \( (7, 7) \) - From \( (3, 7) \): \( (3, 3) \) Thus, the final result for \( R^{-1} \circ R \) is: \[ R^{-1} \circ R = \{(4, 4), (1, 1), (4, 7), (7, 4), (7, 7), (3, 3)\} \] ### Final Answer: \[ R^{-1} \circ R = \{(4, 4), (1, 1), (4, 7), (7, 4), (7, 7), (3, 3)\} \]
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NAGEEN PRAKASHAN ENGLISH-RELATIONS AND FUNCTIONS -Exercies 1a
  1. Give an example of a relation. Which is (i) Symmetric but neither r...

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  2. If A= {x,y,z}, B=(1,2,3} and R= {(x,2),(y,3),(z,1),(z,2), then find R^...

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  3. Prove that the relation R on Z defined by (a ,\ b) in RhArr a-b is di...

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  4. Prove that the relation R={(x,y): x, y in N and x-y " is divisible by ...

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  5. (i) Prove that the relation ""(x)R(y) iff 3 is a factor of (x-y) , de...

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  6. If I is the set of real numbers, then prove that the relation R={(x,y)...

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  7. If A={a,b,c,d}, then on A . (i) write the identity relation I(A) . ...

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  8. Show that the relation geq on the set R of all real numbers is ref...

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  9. Let O be the origin. We define a relation between two points P and ...

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  10. Let N be the set of all natural numbers and let R be a relation on Nxx...

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  11. (i) Show that in the set of positive integer, the relation ' greater t...

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  12. Show that the relation is congruent to on the set of all triangles ...

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  13. Show that the relation geq on the set R of all real numbers is ref...

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  14. Let R be relation difined on the set of natural number N as follows, R...

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  15. Let a relation R be defined by relation The R = {(4, 5), (1,4), (4, 6)...

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  16. If A={1,2,3,5}, B={2,4,6,8} and C={4,16,36,39} are three sets and R i...

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  17. Show that the relation R in the set R of real numbers, defined at R={...

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  18. If R1and R2are equivalence relations in a set A, show that R1nnR2is ...

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