Which would be the proper order of the following (in ascending order) ?
1. Trillion 2. Thousand 3. Billion 4. Hundred 5. Million

Select the number that can replace the question mark (?) in the following series.

$3, 12, 36, 80, ?, 248$

$\text{ Let }{S}_n=1·(n-1)+2·(n-2)+3·(n-3)+\dots +(n-1)·1, n⩾4.$ 

$\text{The sum }\sum _{\mathrm{n}=4}^{\infty }\left(\frac{2{ \mathrm{S}}_{\mathrm{n}}}{\mathrm{n}!}-\frac{1}{(\mathrm{n}-2)!}\right)\text{ is equal to :}$ 

What will be the next term in the series?

$22P, 2Z, 24Q, 4Y, 26R,$ _____?

Which number will replace the question mark $\left(?\right)$ in the following series?

$16, 32, ? , 192, 576, 1152$

Which number will replace the question mark (?) in the following series?

$57, ? , 62, 71, 87, 112, 148$

$B, G, N, W,?$

Find the next term in this series.

$2$R, $9$U, $16$X, ______