JEE Main 2012 Mathematics question
The difference between the fourth term and the first term of a Geometrical Progresssion is 52. If the sum of its first three terms is 26 , then the sum of the first six terms of the progression is
Answer: (3)
Solution
and . Dividing: r − 1 = 2, so r = 3 and a = 2. , option (3).