Find the sum of the arithmetic series given ai = 45, an = 85, and n = 5.

The required sum of the arithmetic series is 325.

Arithmetic series is defined as a sequence of numbers arranged in a particular pattern.

The sum of the nth term of an arithmetic sequence is expressed as:

where:

n is the number of terms

a is the first term

l is the last term

Given the following

a = 45

n = 5

an = l = 85

Substitute the given values in the formula above:

Hence the sum of the arithmetic series is 325

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chad should not have included the values (1, 2) and (3, 6) because that would mean he only had half a healing card.

2nd one in the first row is correct