Arithmetic and geometric progressions

Question 1 of 10

The arithmetic mean of a and b is (a + b)/2.

Question 2 of 10

Find the 7th term of the GP 5, 10, 20, …

Question 3 of 10

The 6th term of the AP 1, 4, 7, … is ___

Question 4 of 10

Find the 8th term of the GP 9, 18, 36, …

Question 5 of 10

The first term of an AP is 6 and the 10th term is 42. Find the common difference.

Question 6 of 10

Find the sum of the first 19 terms of the AP 9, 12, 15, …

Question 7 of 10

The nth term of a GP is

Question 8 of 10

Find the sum to infinity of the series 12 + 6 + 3 + 1.5 + … and the value of n for which the nth term is 3/16.

Question 9 of 10

The first term of an AP is 4 and the 10th term is 49. Find the common difference.

Question 10 of 10

A GP with r = 2 has a sum to infinity.