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Question

Which of the following can be used as a variable?

A
5
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B
a
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C
135
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D
π
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Solution

The correct option is B a
5 is an integer, which has a fixed value. It cannot be used as a variable.
'a' can be used as a variable.
135 also has a fixed value, which cannot be used as a variable.
π is a constant that has a fixed value close to the value of 227. Hence, it cannot be used as a variable.

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