Answer:
By remembering the name of a rather colorful fellow, Roy G Biv. Red, Orange, Yellow, Green, Blue, Indigo, Violet
red yellow pink green purple orange & blue
In the UK, we say Richard Of York Gave Battle In Vain - Red Orange Yellow Green Blue Indigo Violet.
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Richard
Of
York
Gave
Battle
In
Vain
--------------------------------------------------------------------------------------------------
Red
Orange
Yellow
Green
Blue
Indigo
Violet
--------------------------------------------------------------------------------------------------
Roy G. Biv - Red, orange, yellow, Green, Blue, indigo, violet.
Red
Orange
Yellow
Green
Blue
Indigo
Violet
it is just eastist to say it is Roy G Biv stop blabbing on