In a n AP the 8th term is twice the 4th term.The 20th term is 40. Find the common difference
Answers
Answered by
4
Answer:
given a₈ = 2a₄, a₂₀ = 40
to find d
a + 7d = 2(a + 3d)
a + 7d = 2a + 6d
a - 2a = 6d - 7d
-a = -d
a = d
now, a₂₀ = a + 19d = 40
as a = d,
d + 19d = 40
20d = 40
therefore d = 40/20 = 2
d = 2 answer
Answered by
0
given a8=2a4,a20=40
to find d
a+7d=2(a+3d)
a-20=6d-7d
-a=-d
a=d
now a20=a+19d=40
as a=d d+19d=40
20d=40
therefore40÷20=2
d=2 answer
Similar questions