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The first six rows of Pascal's triangle are shown below, beginning with row zero. Except for the 1 at each end, row 4 consists of only even numbers, as does row 2 .How many of the first 20 rows have this property? (Don't include row 0 or row 1).

 Jan 1, 2022
 #1
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Among the first 20 rows, there are 10 rows that have this property.

 Jan 1, 2022
 #2
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its wrong =(
 Jan 2, 2022
 #3
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The EVEN rows are all powers of 2 as follows:

 

2^1 , 2^2, 2^3, 2^4 ==2nd row,  4th row,  8th row,  16th row ==4 rows < 20

 Jan 2, 2022

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