Question

sum of 1st and 21st term of an arithmetic sequence is 140
what is its 11th term
write the sequence of first term is 10​

Answer 1

Answer:

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Step-by-step explanation:

nth term tn=a+(n−1)d

a= First term

d= Common difference

n= number of terms

tn=nth term

Given 

T5+T9=30

a+4d+a+8d=30

2a+12d=30

a+6d=15

a=−6d+15

now