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प्रश्न
A triangle is made up of 2 red sticks and 1 blue sticks 
. The length of a red stick is given by r and that of a blue stick is given by b. Using this information, write an expression for the total length of sticks in the pattern given below:
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उत्तर
Given, length of a red stick = 2r and length of a blue stick = b
From the given figure,
The total number of red sticks = 18
And the total number of blue sticks = 6
So, the total length of sticks = 18r + 6b = 6(3r + b)
Hence, the required expression is 6(3r + b).
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