The terms in two positions of some arithmetic sequences are given below. Write the first five terms of each:
i) 3rd term 34
6th term 67
ii) 3rd term 43
6th term 76
iii) 3rd term 2
5th term 3
iv) 4th term 2
7th term 3
v) 2nd term 5
5th term 2
i) a3 = 34
a6 = 67
a3 = a + 2d and a6 = a + 5d
Solving,a6 = a3 + 3d
∴ d = 11
a2 = 34-11 = 23
a = 23-11 = 12
a4 = 34 + 11 = 45
a5 = 45 + 11 = 56
First 5 terms are 12,23,34,45 and 56
ii) a3 = 43
a6 = 76
a3 = a + 2d and a6 = a + 5d
Solving,a6 = a3 + 3d
∴ d = 11
a2 = 43-11 = 32
a = 32-11 = 21
a4 = 43 + 11 = 54
a5 = 54 + 11 = 65
First 5 terms are 21,32,43,54 and 65
iii) a3 = 2
a5 = 3
a3 = a + 2d and a5 = a + 4d
Solving, a5 = a3 + 2d
d = 0.5
a2 = 2-0.5 = 1.5
a = 1.5-0.5 = 1
a4 = 2 + 0.5 = 2.5
First 5 terms are 1,1.5,2,2.5 and 3
iv) a4 = 2
a7 = 3
a4 = a + 3d
a7 = a + 6d
Solving,a7 = a4 + 3d
d = ![]()
a3 =
= ![]()
a2 =
= ![]()
a =
= 1
a5 = 2 +
= ![]()
First 5 terms are 1,4/3,5/3,2 and 7/3
v) a2 = 5
a5 = 2
a2 = a + d
a5 = a + 4d
Solving,a5 = a2 + 3d
d = -1
a = 5-(-1) = 6
a3 = 5-1 = 4
a4 = 4-1 = 3
a5 = 3-1 = 2
First 5 terms are 6,5,4,3,2.
Hence solved.
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