Arithmetic & Geometric Progressions

T_n = a + (n-1)d = 2 + (4-1)(3)

Term 411

Sum of first 426

First term (a)2

Common difference (d)3

Select Arithmetic, set first term = 2, common difference = 3, n = 4 — the 4th term should read 11
Select Geometric, set first term = 3, common ratio = 2, n = 4 — the 4th term should read 24
On the same AP (a=2, d=3), read the sum of the first 4 terms — it should be 26
On the same GP (a=3, r=2), read the sum of the first 4 terms — it should be 45
Select Arithmetic, set first term = 5, common difference = 5, and find the n whose term equals 20