Which of the following numbers will replace the question mark (?) in the given series?

$\left[\frac{1}{176}\right],\left[\frac{1}{88}\right], ?,\left[\frac{1}{22}\right],\left[\frac{1}{11}\right]$

If '+' means 'division', '-' means 'multiplication', '÷' means 'subtraction' and '×' means 'addition', then what is the value of the following expression?

805 + 23 ÷ 4 - 6 × 2

Select the figure that will come next in the following figure series. 

The difference between the cubes of two given natural numbers is 6272 , while the positive difference between the two given numbers is 8. What is the sum of the cubes of the two given numbers?