![](https://anahitvermishyan.files.wordpress.com/2021/11/image-62.png?w=989)
ա/
7-2=5
12-7=5
22-12=10
27-22=5
բ/ Ոչ
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-63.png?w=1014)
a1=3
a2=3+1*2=5
a3=3+2*2=7
a4=3+3*2=9
a5=3+4*2=11
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-64.png?w=850)
ա/ d=6
բ/
a7=a1+6d=1+6*6=37
a8=a1+7d=1+7*6=43
a9=a1+8d=1+8*6=49
a10=a1+9d=1+9*6=55
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-65.png?w=892)
ա/ Ոչ
բ/ Այո
գ/ Ոչ
դ/ Այո
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-68.png?w=965)
a1=2
a2=a1+d=-1
a3=a1+2d=2+2*-3=-4
a4=a1+3d=2+3*-3=-7
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-69.png?w=942)
Պրոգրեսյա չի
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-70.png?w=764)
ա/ a2=1
d=4
բ/ a1=10
d=3
գ/ a5=10
d=2
դ/ a7=-13
d=-2
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-76.png?w=556)
ա/ a2+a9=120
բ/ a1+21=24
գ/ a3=24
դ/ a6=40
![](https://anahitvermishyan.files.wordpress.com/2021/11/image-77.png?w=877)
ա/ a17=6
բ/ a20=-10
գ/ a5=3
դ/ a8=14