Which of the following expressions can be used to multiply a given number ‘a’ by 4?

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Mr. Dubey • 51.17K Points
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Q.) Which of the following expressions can be used to multiply a given number ‘a’ by 4?

(A) a<<2

(B) a<<4

(D) a>>4

Correct answer : Option (B) - a<<4

Explanation:

 let us consider an example wherein a=2. the binary form of 2 is 0010. when we left shift this value by 2, we get 1000, the value of which is 8. hence if we want to multiply a given number ‘a’ by 4, we can use the expression: a<<2.

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