If the sum of first n terms of an ap is 1/2 (3n²+7n) then find its nth and 20th term.
Автор: M K CLASSES NBD
Загружено: 2025-11-25
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📘 Class 10 Maths | AP Question | Find nth and 20th Term from Sum Formula
In this video, we solve the question:
"If the sum of first n terms of an AP is (1/2)(3n² + 7n), find the nth term and the 20th term."
We use the formula:
an = Sn – S(n–1)
and apply it step-by-step to find the nth term and then substitute n = 20 to get the *20th term*.
🎯 Important for CBSE Class 10 Board Exams and concept building for Arithmetic Progression.
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#Class10Maths #ArithmeticProgression #NthTerm #Chapter5AP #CBSE2025 #NCERTSolutions #Find20thTerm #MathsMadeEasy #BoardExamPrep #APQuestions #SumOfAP
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