Mathematics

Question

what is the 4th term in a geometric sequence for which a1=10 and r=.5

1 Answer

  • First term a1=10 & r=0.5 & n=4

    The formula to find the term =a(n) = a(1)*(r)^(n-1)

    a(4th)=10*(0.5)^3 =1.25


    proof:


    a1=10

    a2=10*0.5=5

    a3= 5*0.5 = 2.5

    a4= 2.5*0.5=1.25
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