two midget subs want to sink an enemy carrier


one sub carries the torp, the other is packed with radar-jammimg devices


they have to go through a narrow, guarded channel, one ahead of the other


the enemy can attack one sub only


the chance the first sub in the channel will survive an attack is 80% but for the second it is 60% as the enemy has more warning


if the sub carrying the torp gets through it is 100% certain to succeed in its mission


which sub should carry the torpedo and how likely are we to destroy the enemy aircraft carrier?