Question

the second term of an arthemtic sequence is 5. find the sum of first and third term

Answer 1

Answer:

Sum of 1st ans 3rd term = 10

Step-by-step explanation:

Let,

The 1st,2nd and 3rd terms be (5-d) , 5 , (5+d)

Here,

Sum of 1st,2nd and 3rd terms = (5-d)+5+(5+d) = 15

Therefore,

Sum of 1st ans 3rd term = (5-d)+(5+d) = 10

Answer 2

Answer:

(5-d)(5+d)=10

Step-by-step explanation:

first and third term