let suppose address of first index of array is n and size of each block of array is u. then the index of second element is a+u. let suppose the array has m elements. what will be the address of the third element of another array of same size, if it's address of second last element is (n - u). [...]

For a certain page trace starting with no page in the memory, a demand-paged memory system operated under the LRU replacement policy results in 9 and 11 page faults when the primary memory is of 6 and 4 pages, respectively. When the same page trace is operated under the optimal policy, the number of page faults may be: (a) 9 and 7 (b) 7 and 9 (c) 10 and 12 (d) 6 and 7 [...]

Suppose that there are nine students in a discrete mathematics class at a small college. a) Show that the class must have at least five male students or at least five female students. b) Show that the class must have at least three male students or at least seven female students. [...]

The answer should be C) Bina. Here is a stepwise solution ->  1. China is sitting 3rd to the left of Dipa.(both facing inside) 2. Elina is not sitting adjacent to either of China or Dipa => only one position is left for her 3. One sitting between Dipa and Fiona will be facing outside => Dipa and Fiona need to have one empty place between them, this fixes the position of Fiona. 4. Gita sits 3rd to the right of Aina => it is not possible if we consider that Aina is facing inside(no empty place with a gap [...]

nth group starts with $(n-1)$$^{2}$ $+$ $1$ and ends with $n$$^{2}$ and every group consists $2n-1$ numbers $15th$ group starts with 196 and ends with $225$ $sum$ = $\frac{No of terms}{2}$ * $[first$ $term$+$last$ $term]$ = $\frac{29}{2} * [(196+1) + 225]$ = $6119$ [...]

acknowledge-Ignored [...]