Questions

In a cached system, the base addresses of the last few referenced pages is maintained in registers called the TLB that aids in faster lookup. TLB contains those page-table entries that have been most recently used. Normally, each virtual memory reference causes 2 physical memory accesses- one to fetch appropriate page-table entry, and one to fetch the desired data. Using TLB in-between, this is reduced to just one physical memory access in cases of TLB-hit.

RAROC is a risk-adjusted framework for profitability measurement and profitability management. It is a tool for measuring risk-adjusted financial performance. And it provides a uniform view of profitability across businesses (Strategic Business Units / divisions). RAROC and related concepts such as RORAC and RARORAC are mainly used within (business lines of) banks and insurance companies. RAROC is defined as the ratio of risk-adjusted return to economic capital.

At least one black can be chosen in two ways from each box:
Now, probability of choosing at least one black ball from first box 

= 1/2 × [ (2C1× 2C1)/4C2 + 2C2/ 4C2 ]= 5/12

Probability of choosing at least one black ball from 2nd box
= 1/2 × [(4C1×12C1)/16C2 + 4C2/ 16C2] = 9/40

Final probability

= 5/12 + 9/40 = (50 + 27)/120 = 77/120

The compound MgCl2 is named as Magnesium Chloride.