Okay, I know the first term is 100. But the common difference I realize you have to divide by 10 because if you subtract 100 by 90 = 10 and 10 - 9 = 1.
an = a1 + (n -1)d
in the sequence 100, 10, 1..., a20 is equal to what?
2 answers
This is a geometric sequence, not an arithmetic.
a = 100 and r = 1/10
does a20 stand for the 20th term?
if so, then
term(20) = ar^19
= 100(1/10)^19
= (1/10)^17
a = 100 and r = 1/10
does a20 stand for the 20th term?
if so, then
term(20) = ar^19
= 100(1/10)^19
= (1/10)^17
1 answer