If 12 people shake hands to each other only once,then the Total number of handshakes is (a) 50 (b) 60 (c) 66 (d) 72 Hints:n(n-1)/2
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Number of bacteria in a vessel is doubled in every minute. If the vessel is fulfilled by bacteria in 40 minutes then how long it takes to be one fourth of the vessels? (a) 10 minutes (b) 20 minutes (c) ...