var firstTerm = parseFloat(document.getElementById(‘firstTerm’).value) || 0;\nvar commonDifference = parseFloat(document.getElementById(‘commonDifference’).value) || 0;\nvar numberOfTerms = parseInt(document.getElementById(‘numberOfTerms’).value) || 0;\n\nvar sumOfSeries = 0;\nvar nthTerm = 0;\n\n// Validate inputs\nif (isNaN(firstTerm) || isNaN(commonDifference) || isNaN(numberOfTerms) || \n firstTerm < 0 || commonDifference < 0 || numberOfTerms <= 0) {\n document.getElementById('result').innerHTML = '

Please enter valid numbers.

‘;\n return;\n}\n\n// Calculate nth term: a_n = a_1 + (n-1)d\nnthTerm = firstTerm + (numberOfTerms – 1) * commonDifference;\n\n// Calculate sum of arithmetic series: S_n = n/2 * (a_1 + a_n)\nsumOfSeries = (numberOfTerms / 2) * (firstTerm + nthTerm);\n\ndocument.getElementById(‘result’).innerHTML =\n ‘

‘ + sumOfSeries.toLocaleString() + ‘

‘;\n}\n\nfunction resetCalculator() {\n document.getElementById(‘firstTerm’).value = 1;\n document.getElementById(‘commonDifference’).value = 1;\n document.getElementById(‘numberOfTerms’).value = 10;\n updateResult();\n}\n\nwindow.onload = function() {\n updateResult();\n};\n\n\n

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Arithmetic Series Calculator

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\n First Term (a₁)\n \n

The first number in the sequence

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\n Common Difference (d)\n \n

The constant difference between terms

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\n Number of Terms (n)\n \n

How many terms to sum

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Sum of the Series (Sₙ)

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Intermediate Values:

Nth Term (aₙ): 0

First Term (a₁): 0

Common Difference (d): 0

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