This is probably one of the easiest and the most scoring area in the Logical reasoning section of any aptitude-based test. Normally, questions from symbols and operations are asked in sets of 3 - 5 questions. So you can fetch easy marks in a short span of time. Lately, this topic is gaining importance as a large number of questions in Logical Reasoning section came from it.Basic Concepts in Logical Reasoning Symboperation
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DIRECTIONS: The symbols %,?,$, #, and ! are used with following meaning:A % B = A is greater than B. A ? B = A is either greater than or equal to B. A $ B = A is smaller than B. A # B = A is either smaller than or equal to B. A ! B = A is equal to B.
Example 1: Statements: S% T, U $ S, T $ S, S ? M, Q ? R.
Solution:Firstly, the statements and conclusions should be converted into the normal symbols for better understanding.
Statements: S > T, U < S, T < S, S ≤ M, Q ≤ R.
Conclusion 1: Since, S > T and U < S. So, U < S > T and, thus, U can be < T or = T or > T. Hence, nothing can be said definitely.
Conclusion 2:Since, T < S and S ≤ M. So, T < S ≤ M. Here again, nothing can be concluded about the relation of M and T.Hence, answer is (e) option.
Example 2: Statements: T $ Q, S ? M, Q ? R, U $ S, S $ T
Solution:Firstly, the statements and conclusions should be converted into the normal symbols for better understanding of the same.
Statements:T < Q, S ≤ M, Q ≤ R, U < S, S < T.
Conclusion 1: Since, T < Q and S < T. So, S < T < Q. Thus, Q > S can be concluded.
Conclusion 2:Since U < S and S < T. So, U < S < T. Thus, conclusion 2 i.e. U < T is definitely true.Hence, answer is (c) option.
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