A partial solution is , if you multiply first digits of  two nos  and result
is greater than 10 then surely result will be a+b digits
If not, according to me, u will need a complex logic to solve.

On Mon, Sep 20, 2010 at 10:41 AM, Srinivas <lavudyasrinivas0...@gmail.com>wrote:

> how to find the no. of digits in the product of two numbers without
> multiplying??
> if a is the number of digits in A and
> if b is the number of digits in B
> the number of digits in A*B is either a+b or a+b-1 but how to find the
> exact one?
>
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-- 
Regards,
Rahul Patil

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