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Cardinality of Sets

If A=a,b:a2+b...

Question

If $A = {(a, b) : a^{2} + b^{2} = 25 and a, b \in N}$ then $n (A) =$

A

1

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B

2

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C

4

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D

12

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Solution

The correct option is B $2$
$A = {(3, 4), (4, 3)} \Rightarrow n (A) = 2$

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Cardinality of Sets

Standard XIII Mathematics

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