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GrogVix [38]
3 years ago
12

How is the sum expressed in sigma notation? 22 + 27 + 32 + 37 + 42 + 47

Mathematics
1 answer:
adelina 88 [10]3 years ago
5 0

The sum expressed in sigma notation is \sum_{n=1}^{6} 5 n+17.

Solution:

Given series is 22 + 27 + 32 + 37 + 42 + 47.

Write it in the sequence form 22, 27, 32, 37, 42, 47.

First term of the sequence = 22

Common difference = 27 – 22 = 5

This is arithmetic sequence.

\text n^{th} term of the arithmetic sequence is

a_n=a_1+(n-1)d

\Rightarrow a_n=22+(n-1)5

\Rightarrow a_n=22+5n-5

\Rightarrow a_n=17+5n

\Rightarrow a_n=5n+17

In the given series number of terms is 6.

So n = 1 to 6.

Write n = 1 in the lower of the sigma and 6 in the top of the sigma.

\sum_{n=1}^{6} 5 n+17

The sum expressed in sigma notation is \sum_{n=1}^{6} 5 n+17.

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