A pet store has two types of betta fish ref betta fish and blue betta fish a customer notices that 7 out of 12 betta fish in the
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D means common difference which is the last term minus second last term .
and u can use this formula only if there is a common difference.
and u can use this formula only if there is a common difference.
I'm not sure if you mean ( ) or (
) I solved it both ways .
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