If the sum and difference of two numbers are 20 and 8 respectively,

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If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their squares is :

1. 12
2. 28
3. 80
4. 160

Correct Option: D

Let x + y = 20 and
x – y = 8
∴ (x + y) (x – y) = 20 × 8
⇒ x² – y² = 160