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Doppler Effect in Light Waves

At a curtain ...

Question

At a curtain shop, curtains are available in 8 colours and 4 designs in each colour-
What is the total number of choices that a customer can choose from?

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Solution

Solution:
Colours available of curtains at the shop $= 8$
Designs available at the shop $= 4$
$∴$ Total number of choices that a customer choose from $= 8 \times 4 = 32$

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