a = (1-0.2)
b = (1-0.3)
c = (1- 0.4)

a*b*(1-c) + a*(1-b)*c + (1-a)*b*c + a*b*c = 0.788

On Wed, Aug 17, 2011 at 5:08 PM, Romil ....... <vamosro...@gmail.com> wrote:

> @Priya: A mistake from my side. The answer should be 1-0.212 i.e. 0.788
> Sorry for this mistake.
> @Kumar: Yours is wrong. Check it again.
>
>
> On Wed, Aug 17, 2011 at 4:42 PM, Romil ....... <vamosro...@gmail.com>wrote:
>
>> Kumar's approach would not do perhaps. I simply eliminated the undesired
>> cases. Those include the one when none of them is active and when only one
>> of them is active.
>> @Kumar: You should have also added the term abc.
>>
>>
>> On Wed, Aug 17, 2011 at 4:39 PM, priya ramesh <
>> love.for.programm...@gmail.com> wrote:
>>
>>> @romil: how did you solve this??
>>>
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>>
>>
>>
>> --
>> Romil
>>
>>
>>
>
>
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