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A 3 digit number is such that it's unit digit is equal to
the product of the other two digits which are prime. Also,
the difference between it's reverse and itself is 396.
What is the sum of the three digits?
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Answer Posted / lalit
Let the number be 100x + 10y + xy.
ofcourse xy > x. therefore 10+x-xy=6, (unit digit of the diff).
Hence x(y-1)=4
x=2, y=3, QED!!
| Is This Answer Correct ? | 4 Yes | 2 No |
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