9999=4,8888=8,1816=6,1212=0,那麼1919=？
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A small correction in your question. It should be 1816 = 3.
Hint : count the number of circles in the number.
= > 9999
The total number of circles in 9999 = 1 + 1 + 1 + 1 = 4.
= > 8888
The total number of circles in 8888 = 2 + 2 + 2 + 2 = 8.
= > 1816
The total number of circles in 1816 = 0 + 2 + 0 + 1 = 3.
= > 1212
The total number of circles in 1212 = 0 + 0 + 0 + 0 = 0
= > 1919
The total number of circles in 1919 = 0 + 1 + 0 + 1 = 2
Therefore, 1919 = 2.
Hope this helps!
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