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
A

`3`

B

`5`

C

`7`

D

This cannot be achieved

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