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Question

A student studying multiplication of variables for the first time got confused because he found two expressions of multiplication written in two different ways:

(1) b×2×a (2) 2ab
Which of them are correct?


A
b×2×a is the only correct form
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B
2ab is the only correct form
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C
Both are correct.
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D
None of them are correct.
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Solution

The correct option is C Both are correct.

In algebra, 2ab means 2×a×b i.e the product of 2, a and b

It is not necessary to explicitly show the multiplication operator or symbol.


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