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# No analyst can ever be completely sure whether the value of a share wi

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Re: No analyst can ever be completely sure whether the value of a share wi [#permalink]
No analyst can ever be completely sure whether the value of a share will rise or not.

In GMAT, use if when it is required to meet a condition:
If she tells the truth, I'll support her.
If the stock price of X goes down to 50 dollar, then I'll buy.

If there is/are alternate options( or can turn unpredictable), then use whether:
I wonder whether I'll go to her birthday party.
Please let the travel agent know whether you'll buy the tickets.
I don't care whether you're from New York or Nottingham.

A. whether the value of a share will rise or not
Grammatically, this is correct, but the sentence can be concise without "or not". Eliminate.

B. if the value of a share will rise
Nobody know about the share price. So there is no condition here. If cannot be used with prediction. Hence, if usage is incorrect. Eliminate.

C. whether or not the value of a share will rise
Redundant usage of "or not" like in option A. Eliminate

D. about whether a share's value will rise or not
Again redundant usage of "or not". Eliminate

E. whether a share's value will rise.

Here whether usage allows other possibilities (stock can go down, stay same etc). Whether is more appropriate with predictions. Hence, this is concise and correct.
So the right choice is E.
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No analyst can ever be completely sure whether the value of a share wi [#permalink]
On the GMAT, use “if” in a conditional sentence to show that one thing will happen if something else happens. Use “whether” to show that two alternatives are possible.

the easiest way to identify a conditional sentence is to reverse the order and the meaning will still remain the same:
eg
John will go to Harvard if he gets a scholarship
Reverse- If John gets a scholarship, he will go to Harvard.

In the above sentence, usage of "If" is correct.
But in our question, there are no such conditions, so option B can be eliminated.

You can test it by reversing the line-
If the value of share will rise, no analyst can ever be completely sure.
This makes no sense at all.

Secondly, if the word "whether" is already used, then the use of "or not" is redundant
So options A,C and D can be eliminated.

Option E seems to be the best one.

A kudos will be highly appreciated
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Re: No analyst can ever be completely sure whether the value of a share wi [#permalink]
use of "whether....or not" is incorrect.so A,C and D are out.
C has conditional "if" .makes no sense in the sentence
IMO E
Re: No analyst can ever be completely sure whether the value of a share wi [#permalink]
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