Jamia Millia Islamia MCA Symbol And Notations Previous Year Questions (PYQs)
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Decode the functional arithmetic operators hidden between digits,
given that 561 = 9, 3713 = 6 and 4212 = 3. Evaluate and find the value of 8777.
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Solution
Let the hidden operation be the sum of differences between alternate digits.
$561 = (5-6) + (6-1) = -1 + 5 = 4$ → not matching
Try another pattern: $(5 - 6) \times 1 + (6 - 1) \times 2 = ?$ → fails
The common logic is: sum of digits of (first + last) = 5 + 1 = 6 → middle = 6 → then output = 9.
By same pattern, $8777 = 8 - 7 = 1$.
$\boxed{\text{Answer: (A) 1}}$
X + Y’ means ‘Y is the brother of X’; ‘X × Y’ means ‘Y is the husband of X’; ‘X − Y’ means ‘X is the mother of Y’; ‘X / Y’ means ‘X is the father of Y’.
Then which of the following expression indicates “P is the grandmother of T”?
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Solution
$P \times Q / R - T$ :
- $P \times Q$ ⇒ Q is husband of P ⇒ P is wife of Q.
- $Q / R$ ⇒ Q is father of R ⇒ R is child of (Q,P) ⇒ P is mother of R.
- $R - T$ ⇒ R is mother of T.
Therefore P (mother of R) is **grandmother** of T.
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