There are n stations in a slotted LAN. Each station attempts to transmit with a probability p in each time slot. What is the probability that ONLY one station transmits in a given time slot?

In Ethernet when Manchester encoding is used, the bit rate is:

Consider a pipelined processor with the following four stages
$$\,\,\,\,\,$$$$IF:$$ Instruction Fetch
$$\,\,\,\,\,$$$$ID:$$ Instruction Decode and Operand Fetch
$$\,\,\,\,\,$$$$EX:$$ Execute
$$\,\,\,\,\,$$$$WB:$$ Write Back

The $$IF, ID$$ and $$WB$$ stages take one clock cycle each to complete the operation. The number of clock cycles for the $$EX$$ stage depends on the instruction. The $$ADD$$ and $$SUB$$ instructions need $$1$$ clock cycle and the $$MUL$$ instruction needs $$3$$ clock cycles in the $$EX$$ stage. Operand forwarding is used in the pipelined processor. What is the number of clock cycles taken to complete the following sequence of instructions?

Consider a machine with a byte addressable main memory of $${2^{16}}$$ bytes. Assume that a direct mapped data cache consisting of $$32$$ lines of $$64$$ bytes each is used in the system. $$A\,\,50 \times 50$$ two-dimensional array of bytes is stored in the main memory starting from memory location $$1100H.$$ Assume that the data cache is initially empty. The complete array is accessed twice. Assume that the contents of the data cache do not change in between the two accesses.

Which of the following lines of the data cache will be replaced by new blocks in accessing the array?