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1/an = a_{n+1}-1
a₃=5/2
1/a₂=5/2-1=3/2
A) Prawda
a₂=2/3
B) Fałsz
a₁=2/3-1= -1/3 < 0
C) Prawda
a₄=1+1/a₃
a₄ = 1+1:5/2 = 1+2/5 = 7/5