Question

the sum of first and 21st term of arithmetic sequence is 140.find 11th term​

Answer 1

Answer:

hey mate here is your answer,

Step-by-step explanation:

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Answer 2

Answer:

Eleventh term is 70.

Step-by-step explanation:

Given: sum of first 21st term : 140

To find: 11th term.

Let first and last term be a1 and a2 respectively.

Let d be the number of terms in between first and last term.

Therefore,

a1+ a2= 140

a+ a- 20d= 140

2a - 20d =140

2(a- 10d)= 140

(a-10d)= 140/2

a-10d= 70

a11= a-10d

Hence eleventh term a11 is 70.