Question

1,3,5, is an arithmetic sequence
what is the 20th term​

Answer 1

Answer:

a(20)=1+(20-1)×2. a(20)=1+19×2. a(20)=1+38. a(20)=39. hence,the 20th term is 39.

Step-by-step explanation:

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Answer 2

$\rm{Formula\:Used:n^{th}\:term=a+(n-1) d}$              

$\bullet\:\:\textrm{In our Question; We have a = 1, d = 2 and n = 20}$

$\longrightarrow\rm{20^{th}\:term=1+(20-1)\times2}$

$\longrightarrow\rm{20^{th}\:term=1+2\times(20-1)}$

$\longrightarrow\rm{20^{th}\:term=1+2\times 19=1+38=39}$