Question

Se considera progresia aritmetrica [/tex]$(a_n) n_ \geq 1 a_1_5=29 r=2 Sa se calculeze a_1$

Answer 1

n≥1
a₁₅=29
r=2
______
a₁=?

[tex]a_n=a_1+(n-1)r a_{15}=a_1+(15-1)r a_{15}=a_1+14r 29=a_1+(14*2) 29=a_1+28 a_1=29-28 a_1=1 [/tex]