TCS Company Logical Reasoning Missing Character

there are 40 barreals are there and one is poisoned. If a drop is consumed he will die in 14 hrs then how many least mice are required to find the poisoned barreal?if we have only 24 hour.

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TCS Other Question

Q. 10 people meet and shake hands. The maximum number of handshakes possible if there is to be no "cycle" of handshakes is (A cycle of handshakes is a sequence of k people a1, a2, ......, ak (k > 2) such that the pairs {a1, a2}, {a2, a3}, ......, {ak-1, ak}, {ak, a1} shake hands).
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A wire whose resistance is 132.44647 ohms,is used in an experiment. if a voltage of 30mv and a current of 296ma is applied to it, what is the resistance then?