self Maths Puzzle

(Y1,Y2,Y3,…,Y(n−1) ,Yn ) is a sequence of positive integers and n^2(Yn − Yn−1) − n(Yn + Yn−1). y1=y2=y3=1 . y50 ?

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self Other Question

the population of a country increases by 5%,10% and 15% in 3 consecutive years. what is the approximate overall percentage increase for the three years?

1.30%
2.31%
3.33%
4.34% In Traffic signals, red flashes 3 times per minute and green flashes 5 times in 2 minutes at regular intervals.if both lights starts flashing at the same time, how many times do they flash together in each hour?