GP and AP formulas (quick re-run)

Question 1

2 of the AP formulas:
(Ofc both in data booklet)

Answer 1

Sn = n/2 (2a + (n-1)d)
&
a + (n-1)d

Question 2

3 of the GP formulas:
(First 2 in data booklet)

Answer 2

S = a(1-rⁿ)/1-r
&
S∞ = a/1-r
&&&
t = ar^(n-1)