1]a mathematical sentence which contains a variable such that  it may be true or false depending on the values of the variable , is called an                    sentence 
2] in the product of a variable and a constant each is called the               of the other 

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1.A mathematical sentence which contains a variable such that  it may be true or false depending on the values of the variable, is called an open sentence.2. In the product of a variable and a constant each is called the coefficient of the other.

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1. simple equation
 
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2.co-efficient
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