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Addition and subtraction find the missing number in each pattern 1,5,9 blank 17,21 ​
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Addition and subtraction find the missing number in each pattern 1,5,9 blank 17,21

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User Tpikachu
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the number is 13



explained :
everytime the pattern goes on, you add 4. in conclusion, 9+4=13
User Lowell
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