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### Question Asked by a Student from EXXAMM.com Team

** Q 2441391223. ** Six identical cards are placed on a table. Each card

has number '1' marked on one side and number '2'

marked on its other side. All the six cards are placed

in such a manner that the number T is on the upper

side. In one try, exactly four (neither more nor less)

cards are turned upside down. In how many least

number of tries can the cards be turned upside down

such that all the six cards show number '2' on the

upper side?

**IAS 2014 Prelims **