Write the following set in the roster method :
$A = x / x i s a c o l o u r i n t h e r a i n b o w$

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Solution

$A = {x : x is colour in rainbow}$
As we know that,
Colours in rainbo are violet, indigo, blue, green, yellow, orange, red.
Therefore,
$A = {violet, indigo, blue, green, yellow, orange, red}$

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