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21. The number of edges in a 3X5 mesh is ______
8
15
22
24
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22. Which of the following CRCW PRAM variants is not known to be self-simulating?
Common
Tolerant
Arbitrary
Priority
23. Suppose we have three sorting algorithms X1, X2, and X3 on PRAMs.X1 runs in O(log n) time using nlog n processors.X2 runs in O(log2 n) time using n/log n processors.X3 runs in O(log n log log n) time using n/log n processors.Which of the algorithms is/are optimal?
only X1
only X1 and X3
only X2
only X2 and X3
24. A CREW PRAM algorithm of 4 steps have degrees of parallelism of 10, 14, 8 and 22 in its four steps. On a PRAM with 12 processors, the algorithm can be simulated in ___ steps
4
5
6
25. When the balanced binary tree based parallel algorithm for finding prefix sums is run on "1 2 4 6 9 13 18 25", what is the value send to the right child by the internal node whose sum is 65?
13
18
35
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