A multicomputer with 256 CPUs is organized as 16 × 16 grid. What is the worst case delay (in hops) that a message might have to take ?
(A) 16
(B) 15
(C) 32
(D) 30


Answer: (D)

Explanation: We have 16 x 16 grid, There will be (M – 1) * (N – 1) hops for M * N grid.
In the given question M = N.
# of hops = (M – 1) * (M – 1)
= 2 * (M – 1)
= 2 * (16 – 1)
= 2 * 15
= 30 hops.
So, option (D) is correct.

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