Find the A.P. whose 3rd term is 18 and 12th term is 72.

How many terms are there in the Arithmetic Progression given below?

7, 13, 19, ..., 205

Which should replace the question mark

$(4.25 + 2.75)^2 + ? = 5^3 - (9 \times 8)$

If $\Delta$ stands for the operation on adding first number to the twice of the second number. Then, find the value of $(2\ \Delta\ 3)\ \Delta\ 4$.

It is observed that in each case, every term except the first term bears a constant ratio to the term immediately preceding it. Such sequences are called:

If $243^{3x} = 27^{(4x-1)}$, then the value of $4^x$ is:

What will come in place of the question mark (?) in the following sequence?

$125 \times 24 + 60\%\ of\ 660 = 4 \times ?$