Multiple Choice Question: What type of sequence is 12, 6, 4, 3, ...?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

Solve for $x^2$ if $48^{1/x} = 4 \times 3^{1/x}$.
The probability that a certain kind of component will survive a given shock test is ¾. Find the probability that exactly 2 of the next 4 components tested survive.
The Venturi meter is used to measure the presence of flow in the pipe system, the section of the pipe with the smallest pressure is called:
For a spherical triangle: A = 63deg 19.6min; b = 124deg 17.8min; and c = 83deg 16.6min, find a.
A stone is dropped into a well and the report of the stone striking the bottom is heard 7.7 seconds after it is dropped.
Compute the cost of lumber necessary to resurface a foot-bridge 16 feet wide and 150 feet long with 2-inches planks, if lumber is P48.00 per board foot.
The area under the entire stress-strain curve is called:
Find the perimeter of the ellipse with major-axis = 10 and minor-axis = 8.
The sum to infinity of $\dfrac{1}{7} + \dfrac{2}{7^2} + \dfrac{1}{7^3} + \dfrac{2}{7^4} + \ldots$ is:
A company invests P10,000 today to be repaid in five years in one lump sum at 12% compounded annually. If the rate of inflation is 3% compounded annually, how much profit in present day pesos is realized over five years?
Two cars A and B are traveling at the speed of 30 kph and 40 kph respectively on two different roads making an angle of 30 deg with each other.
If three coins are tossed, how many possible ways are there of at least one coin showing tails?
Determine the amplitude of $y = 4 \cos 2x$.
If an arc length is 12 m subtends a central angle $\phi$ in a circle of radius 3, find the measure of $\phi$ in terms of radians.
The price of an article is cut by 10%. To restore it to its former value the new price must be increased by: