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what is the equation for selecting a winning numbers for a lotto wheel if 90 numbers are put in the wheel and five had been selected first 13-6-60-24-48 what is the equation for selecting five another winning numbers

In A.P the difference between the 8th term and 4th term is 20,and the 8th term is one and half times the 4th term.Find the common difference, and the first term.

1) a=-20 Sn=250 . n=10 Sn=n/2(2a+(n-1)d) 250=10/2(2(-20)+(10-1)d) 250=5((-40)+(9)d) 250=-200+45d 250+200=45d d=10 Un=a+(n-1)d Un=-20*(10-1)10 Un=-20+900 Un=880 ::the last term=880

2) a=-12 . Un=-6 d=-3 n=5 S5=5/2(2(-12)+(5-1)-3) 2.5(-24)+-12) . 2.5(-36) S5=-90