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3 balls inside a bag having nos on it written 1 , 2, 3 on it. a ball is taken and then put inside it. Find probability that all 3 nos r the same when it is taken 3 times

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if x+y+z =1. then xy+yz+zx is
a)1/2 c)=1/2
three men invested sum. and their ratio is 5:7:6. profit is 5400.then b's share