An indium foil is counted at $5$:$00$ p$.$m$.$ Tuesday and found to yield $346,573$ CPM in a counter with a $50\%$ efficiency for the $54-$min In$-116$m activity. What is the probability that none of these radioactive In$-116$m nuclei will remain in the foil at $2$:$00$ p$.$m$.$ Thursday, the same week? $($Note: In$(1-$x$)$~$-$x$,$x$1)[$Victims working this problem can thank Dr$.$ Ronald Fleming.$]2-21.$ An indium foil is counted at $5$:$00$ p$.$m$.$ Tuesday and found to yield $346,573CPM$ in a

counter with a $50\%$ efficiency for the $54-$min In$-116m$ activity. What is the probability

that none of these radioactive In$-116$m nuclei will remain in the foil at $2$:$00$ p$.$m$.$

Thursday, the same week? $($Note: $ln(1-x)-x,x1)[$Victims working this problem

can thank Dr$.$ Ronald Fleming.$]$