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Mr. Dubey • 52.74K 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
(C) a>>2
(D) a>>4
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Explanation by: Mr. Dubey 
 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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