Q. Find the 14th term of the geometric sequence 5,10,20,…Answer:
Identify first term: To find the 14th term of a geometric sequence, we need to use the formula for the nth term of a geometric sequence, which is an=a1×r(n−1), where a1 is the first term, r is the common ratio, and n is the term number.
Find common ratio: First, we identify the first term a1 of the sequence, which is 5.
Calculate 14th term: Next, we need to find the common ratio r. We can do this by dividing the second term by the first term, or the third term by the second term. Let's use the second term divided by the first term: r=510=2.
Calculate 213: Now that we have the first term and the common ratio, we can find the 14th term (a14) using the formula: a14=5×214−1=5×213.
Multiply to get 14th term: Calculating 213: 213=8192.
Multiply to get 14th term: Calculating 213: 213=8192. Now, we multiply the first term by 213 to get the 14th term: a14=5×8192=40960.
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