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two years before paul's age is 2 times the alice age and present age of paul is 6 times the alice .what is present paul's age

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TCS Other Question

age of the 2 people are in ratio 6:5 after how many years,their ratio will be 8:7 what to do for:
1.cyclic handshake
2.acyclic handshake
3.when to apply n(n-1)/2