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adjei
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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
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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
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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
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
