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nirvana33 [79]
3 years ago
8

The explicit rule for an arithmetic sequence is An=20/3 / 1/3 (n-1)

Mathematics
2 answers:
Gennadij [26K]3 years ago
8 0

Answer:

the value of the 89th term is 36

Step-by-step explanation:

Given : A_{n} =\frac{20}{3} +\frac{1}{3} (n-1)

To Find : 89th term

Solution :

The general  explicit rule for an arithmetic sequence  is

A_{n}  = A_{1} +D(n-1)


A_{1}  is the first term of sequence .


D is the common difference

so, in given sequence :


A_{1}= \frac{20}{3}


D= \frac{1}{3}


n = 89

so, to find 89th term

using given explicit formula :


A_{n} =\frac{20}{3} +\frac{1}{3} (n-1)


put n = 89


⇒A_{89} =\frac{20}{3} +\frac{1}{3} (89-1)


⇒A_{89} =\frac{20}{3} +\frac{1}{3} (88)


⇒A_{89} =\frac{20}{3} +\frac{88}{3}


⇒A_{89} =\frac{108}{3}


⇒A_{n} = 36


Thus, the value of the 89th term is 36

Troyanec [42]3 years ago
5 0
We are to solve for the 89 term of the Arithmetic equation given below:
An = 20/3 + 1/3 (n-1)
Replacing n with 89, we have:
An = 20/3 + 1/3 (89-1)
An =20/3 + 1/3 (88)
An = 20/3 +88/3
An =108/3
An = 36

The 89th term is 36.
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