1. if the sequence x,a1,a2,y and x,b1,b2,y are in A.P then a2 -a1/b2-b1 is equal to ............
  2. the three sides of a right triangle are in A.P one of the side could have lenght ........
  3. the no.of terms of an A.P is even . the sum of odd terms is 24 and the sum of the even terms is 30 . if the last term exceeds the first term by 10.5 then the no.of terms in A.P is .............

Hi!
Here is the answer to your question.
(i)
x, a1, a2, y are in A.P.
Let d be the common difference of the A.P.

(ii)
Let a – d, a, a + d be three sides of a right angled triangle where d is common difference of A.P.
Thus, one of the sides could have length 4 units.
iii)
Let a1, a2, a3, a4a2n be the A.P.
Then,
a1 + a3 +a5 +… a2n–1 = 24  (1)
a2 + a4 +a6 +… + a2n = 30  (2)
Thus, number of terms in A.P. is 4.

Best wishes!

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