Write the rule — task. Mathematics State Board, Class 6.

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With the help of variable, find the rule which gives the number of matchsticks needed to make the pattern.

1. A pattern of letter \(I\) as

i

[Note: Use \(y\) as the variable to write the rule]

2. A pattern of letter \(M\) as

i

[Note: Use \(y\) as the variable to write the rule]

Did you find an error?

9. Write the rule