How many terms are there in the G.P. 3, 6, 12, 24, ... , 384 ?Options810119
Question
How many terms are there in the G.P. 3, 6, 12, 24, ... , 384 ?Options810119
Solution
A geometric progression (G.P.) is a sequence of numbers where each term after the first is found by multiplying the previous term by a fixed, non-zero number called the common ratio.
In this case, the common ratio (r) is 6/3 = 2.
The formula to find the nth term (Tn) of a G.P. is: Tn = a * r^(n-1), where a is the first term.
We know that the nth term is 384 and the first term (a) is 3. So, we can set up the equation as follows:
384 = 3 * 2^(n-1)
Divide both sides by 3:
128 = 2^(n-1)
Since 128 is 2 to the power of 7, we can say that 2^(n-1) = 2^7
Therefore, n - 1 = 7
Solving for n gives us n = 8.
So, there are 8 terms in the G.P. 3, 6, 12, 24, ... , 384. The correct option is 8.
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