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nevsk [136]
3 years ago
14

The last term of an arithmetic sequence is 14 and the ninth term is -1. Find the first four

Mathematics
1 answer:
Olegator [25]3 years ago
8 0

Answer:

13

Step-by-step explanation:

where n is the number of terms, a1 is the first term and an is the last term. The sum of the first n terms of an arithmetic sequence is called an arithmetic series . Example 1: Find the sum of the first 20 terms of the arithmetic series if a1=5 and a20=62 .An arithmetic sequence is a sequence where the difference between any two consecutive terms is a constant. ... As with any recursive formula, the initial term of the sequence must be given. An explicit formula for an arithmetic sequence with common difference d is given by an=a1+d(n−1) a n = a 1 + d ( n − 1 ) .

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Urgent!! please help )):​
alisha [4.7K]

The 16th term is: 53

Further explanation:

We have to find the general formula first

The general form is:

a_n=a_1+(n-1)d\\Given\\a_1=8\\d=3\\Putting\ the\ values\ in\ the\ formula\\a_n=8+(n-1)(3)\\a_n=8+3n-3\\a_n=5+3n\\For\ 16th\ term, put\ n=16\\a_n=5+3(16)\\a_n=5+48\\a_n=53

The 16th term is: 53

Keywords: Arithmetic sequence, Common Difference

Learn more about arithmetic sequence at:

  • brainly.com/question/5510873
  • brainly.com/question/5461619

#LearnwithBrainly

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3 years ago
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Answer:

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Step-by-step explanation:

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