Others Maths Puzzle Numerical Ability Permutation and Combination

(2n+1)P(n-1):(2n-1)P(n)=7:10
find n

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Others Other Question

A and B can complete a job in 80 days and 120 days respectively.they worked on it alternate days.how many days would they take to complete it..// If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it?