Expression Tree Evaluation

Question

While evaluating the expression tree, if the left or right child is not present then the value of that particular missing child is taken as 0?

Have a look at this question

In my evaluation, I am getting: ( (a-0) - b ) - 0 + e! = a-b+e!

Answer is given as option c but by this approach, I am getting option (d) as the answer.

Comments

i think the value is satisfied only when a=b and e=0... i am getting only one value..

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@garvit_vijai OPTION D HOW ???

WE WANT 1 . IN OPTION D e =1  ,, WE DONT WANT THIS NEGATION SYMBOL.  SO E ALWAYS BE 0

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1! = 1, So, option 4 also satisfies

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@garvit_vijai I MISUNDERSTOOD THAT SYMBOL AS NEGATION   :\

YEPP THEN OPTION 4 ALSO SATISFIES..

Answer 1

On solving this expression we got a+b+e!

On putting a=-b and e=0 we got 0! Which is equals to 1. So option 1 is correct

On putting a=-b and e=1 we got 1! Which is eauals to 1. So option 2 is correct,

Hence 1 and 2 are correct

So the answer is (c).