find the 15th term from end of -10, -20, -30, ...., -1000.
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Here, a = -10 , ar = -20 ,
so ar/a= -20/-10=> r=10
15th term is = ar>15-1
=-10*10>14
=-10>15
so ar/a= -20/-10=> r=10
15th term is = ar>15-1
=-10*10>14
=-10>15
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