@gateaspirant, Expect it very soon.

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Yes, you are right.
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Below is the great example on fork(). I hope you have gone through it: 

http://www.techtud.com/example/very-good-example-fork

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21 Feb 2016 - 6:05pm

bit explanation will be helpful.

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29 Jan 2016 - 2:16pm

From which test the questions do belong ?

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@antonio, Can you please help me solving this ?

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15 Jan 2016 - 12:26am

@jay_krishna, @digvijay, Please have a look.

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as they r in proportion i.e     a/b=c/d so ad=bc---------(i)

now solving     (a-b)(a-c)/a = a^2-ac-ab+bc/a from eqn (i)

(a-b)(a-c) = a^2-ac-ab+ad

‚Äčtaking a common i.e a(a-c-b+d)/a

cancelling a with 1/a gives a+d-b-c i.e OPTION B

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