" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
a₆ - a₃ = 9
a₁ + r + a₁ + 3r = 2
a₁ + 5r - a₁ - 2r = 9
3r = 9
r = 3
2a₁ + 4r = 2
2a₁ + 4*3 = 2
2a₁ = 2-12
2a₁ = -10
a₁ = -5