Question 333200
the general form of geometric sequence is
 a,ar,ar^2,ar^3.........
where a is the first number
r is the common ratio
given 5, 15, 45 
a=5 and r =3

a =5
ar =5*3=15
ar^2=5*3^2
    =5*9 =45
ar^3 =5*3^3
    =5*27 =135
ar^4 =5*3^4
     =5*81=405
ar^5=5*3^5
     =5*243=1215

therefore the geometric sequence  are
5,15,45,135,405,1215...