Activity 1 - Pre-Assessment
D
A
D
A
A
A
D
D
B
C
A
1+1=2
1+2=3
2+3=5
3+5+8
5+8+13
A
Common ratio is 5
3, 15, 75, 375, 1875, 9375, 46875
=58,593
B
an= a r^n-1
common ratio r=3
first term a=3
n=8
= ar^8-1
= ar^7
= 3 x 3^7
= 3 x 2187
=6156
C
3 x 5 = 15 3 x 11 = 33
3 x 6 = 18 3 x 12 = 36
3 x 7 = 21 3 x 13 = 39
3 x 8 = 24 3 x 14 = 42
3 x 9 = 27 3 x 15 = 45
3 x 10 = 30 3 x 16 = 48
15 + 18 + 21 + 24 + 27 + 30 + 33 + 36 + 39 + 42 + 45 + 48 = 378
A
an = (n² - 1)/(n² + 1)
a7 = (7² - 1)/(7² + 1)
a7 = (49 - 1)/(49 + 1)
a7 = 48/50 = 24/25
d
c
d
a
a
c
a
b
c
a