WHAT IS RECALL?
RECALL is real exam questions according to latest examinee’s recall (REQALER).
PS
There are 4 piles of balls, each with m pieces. Put the balls in the first pile into the other piles, and the ratio is 1:6:4:5? (Anyway, it adds up to 16 copies)
Ask how to use m to represent the ball taken out from 1
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