There can be only 2 possibilities either X or Y. If X occurs first then prob.of X occurring next is 0.4, and if Y occurs 1st prob. of Y occurs next is 0.3. So if X occurs at 5th instant what is the prob. that x will occur at 7th instant?
2026-04-13 17:26:23.1776101183
Probability of X
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i think $0.6\times0.7+0.4\times0.4=0.58$