Question
relation R(ABCD) has these dependencies {A → B, B →
C,C → D} and it is decomposed into three relations R1(AB) , R2(BC), AND R3(CD). State true or false if the decomposition is dependency preserving or not?Solution
The decomposition is dependency preserving. Because the union of all the functional dependencies from R1, R2 AND R3 is equal to the dependencies that are in relation R.
Select the correct sequence of mathematical signs to replace the ‘@’ signs so as to balance the given equation.
264 @ 44 @ 17 @ 6 @ 32 = 76
If P denotes ‘multiplied by’, T denotes ‘subtracted from’, M denotes ‘added to’ and B denotes ‘divided by’, then 50 B 5 P 16 T 15 M 13 ...
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
48 * 495 * 5 * 2 * 120 = 126
If ‘÷’ means ‘-’, ‘-’ mean ‘+’, ‘+’ means ‘×’ and ‘×’ means ‘÷’, compute the value of the expression:
132 × ...
Two trains start at the same time from Dehradun and Jaipur and proceed toward each other at the speed of 55 km/hr and 25 km/hr respectively. When they m...
- Which two signs should be interchanged to correct the given equation?
5 + 3 × 8 – 12 ÷ 4 = 3 Which of the following interchange of numbers and mathematical signs would make the given equation correct?
72 ÷ 8 × 9 − 36 + 20 = 80
In a certain code of language, ‘+’ represents ‘×’, ‘-‘ represents ‘+’, ‘×’ represents ‘÷’ and ‘÷’ represents ‘-‘. Wh...
- If ‘%’ means (÷), ‘&’ means (+), ‘$’ means (×), and ‘@’ means (-), then what is the value of the expression:
42 & 54 % 9 @ 11 $ 3 What will be the value of expression if the numbers/digits ‘(30)’ and ‘(13)’ are interchanged?
78 ÷ 30 × 6 + 13 - 14 + 12
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