Question

find d whose first term is 5 and the sum of its four terms is half the sum of the next four terms

Answer 1

Answer:

let d is common difference of AP

now first 4term is 5,5+d,5+2d,5+3d

and next 4term 5+4d,5+5d,5+6d,5+7d

now according to question  

20+6d=(20+22d)/2

20+6d=10+11d

d=2

Answer 2

Answer:

ıllıllı нєу ıllıllı

Step-by-step explanation:

Let d is Common Difference of AP

Now First 4term is 5 , 5 + d , 5 + 2d , 5 + 3d

And next 4term  5 + 4d , 5 + 5d , 5 + 6d, 5+ 7d

Now According to Question  

20 + 6d = (20+22d) /2

20 + 6d = 10 + 11d

d = 2

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