Question

Find the sum of the ten term of the A.P.:8,10,12,14,…,126?

Answer 1

The answer is given in the attached file.

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Answer 2

Answer:

Step-by-step explanation:

n=(l-a/d)+1

n-=(126-8/2)+1

=(118/2)+1 =60

60 is our n term execute that in the below formula,

Sn = n/2 [2 a+( n−1) d ]

Sn= 60/2[2*8 + (29*2)]

we get final answer 2220