Answer:
2
Step-by-step explanation:
Given AP where:
To find
Since
- a₄ = a₁ + 3d
- a₂ = a₁ + d
- a₆ = a₁ + 5d
Initial equations will change as:
- a₁ + 3d = 2(a₁ + d) - 1 ⇒ a₁ + 3d = 2a₁ + 2d - 1 ⇒ a₁ = d + 1
- a₁ + 5d = 7 ⇒ a₁ = 7 - 5d
Comparing the above:
- d + 1 = 7 - 5d
- 6d = 6
- d = 1
Then:
- a₁ = d + 1 = 1 + 1 = 2
- a₁ = 2
The first term is 2
