ikkita yashikda radiyo lampalar bor Birinchi yashikda 12 ta lampa bulib 1 tasi yaroqsiz ikkinchi yashikda 10 ta lampichka bo'lib ularning 1 tasi yaroqsiz Birinchi yashikda bitta lampa olib ikkinchi yashikka solinadi ikkinchi yashikdan tavakkliga olingan lampaning yaroqsiz bo'lish ehtimolini toping