Question

the common difference of an ap whose 8 term from last is 30 and last term is 65 is​

Answer 1

Answer:

the common difference of an ap whose 8 term from last is 30 and last term is 65 is​

let the AP : a, a+d, a+2d ......

to calculate the nth term of an AP from last, we need to write it in reverse order

New AP : 65, 65+d, 65+2d

Let the common difference be D

D= a2-a1

D= (65+d)-65

D= 65+d-65

D= d

Now,

the 8th term =30

a1+(8-1)D = 30

65+7d =30  

7d=30-65

d= -35/7

d= -5

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Answer 2

Answer:

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