Give a fast way to multiply a number by 7
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Answer Posted / rajan
ANU is right the answer is x<<3 -x
when you left shift any number by 1 it is equivalent to
multiplying with 2.
so, left shift by 3 means ur are multiplying with 8.
and x*7 = x(8-1) = x*8-x = x<<3-x .
| Is This Answer Correct ? | 31 Yes | 5 No |
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