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Question

3 person were given certain calculations to perform. The calculations were 1 + 1, 1 +-1+2, and 1 +2. Their respective answers were 3,3 and 2. How many of them are mathematicians
(I) Mathematicians can never add two numbers correctly, but they add three numbers correctly
(II) Whenever the mathematicians add two numbers there is a mistake of +1 or -1

A
Statement (I) ALONE is sufficient, but statement (II) B alone is not sufficient
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B
Statement (II) ALONE is sufficient, but statement (I) alone is not sufficient
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C
BOTH statements TOGETHER are sufficient, but NEITHER statement alone is sufficient
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D
EACH statement ALONE is sufficient
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Solution

The correct option is D EACH statement ALONE is sufficient
From the first statement it gives that mathematician can never add 2 number correctly, but it is quite possible that apart from mathematician, others can also do the same mistake.
The same logic is applied for the second statement as mathematician is given. If it is only mathematician then we can answer with the help of both the statements.

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