CGL 21 Tier 2 Maths


Question 1

$$ \text{What is the simplified value of} \frac{(x+y+z) (xy+yz+zx)- xyz} { (x+y) (y+z) (z+x) } ?$$

$$ \frac{(x+y+z) (xy+yz+zx)- xyz} { (x+y) (y+z) (z+x) }$$ का सरलीकृत मान कितना होगा?


Options

A

1

1

B

x

x

C

y

y

D

z

z


Solution:

Correct Answer:

A

1

1


$$ \frac{(x+y+z) (xy+yz+zx)- xyz} { (x+y) (y+z) (z+x) }$$

$$ \text{Let's put  x = y = z = 1}$$

$$ \frac{(1+1+1) (1+1+1)- 1} { (1+1) (1+1) (1+1) }$$

$$ \frac{9 - 1} { 8 } = 1$$ 

$$ \frac{(x+y+z) (xy+yz+zx)- xyz} { (x+y) (y+z) (z+x) }$$

$$ \text{x = y = z = 1}$$

$$ \frac{(1+1+1) (1+1+1)- 1} { (1+1) (1+1) (1+1) }$$

$$ \frac{9 - 1} { 8 } = 1$$ 

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