Q 52. If the product of first 5 terms of gp is 243, find the middle term of a GP, I.e. the third term. Ops: A. 2 B. 4 C. 6 D. 3
Question
Q 52. If the product of first 5 terms of gp is 243, find the middle term of a GP, I.e. the third term.
Ops:
A. 2
B. 4
C. 6
D. 3
Solution
The product of the first 5 terms of a geometric progression (GP) is given as 243.
Let's denote the first term of the GP as 'a' and the common ratio as 'r'.
The first 5 terms of the GP can be written as: a, ar, ar^2, ar^3, ar^4.
The product of these 5 terms is: a^5 * r^10 = 243.
We are asked to find the middle term of the GP, which is the third term, ar^2.
Since the product of the first 5 terms is 243, we can write the equation as: a^5 * r^10 = 243.
Taking the fifth root of both sides to isolate 'a', we get: a = (243)^(1/5) = 3.
Substituting 'a' back into the equation for the third term, we get: ar^2 = 3r^2.
Since we don't know the value of 'r', we can't find a specific numerical value for the third term. However, we know it will be some multiple of 3.
So, the closest answer from the options given is:
D. 3
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