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Per NCERT, the FIRST KNOWN written mention of the formula Sₙ = n(n+1)/2 appears in which classical Indian text?
ABhāskara's Lilāvatī
BBrahmagupta's Brahmasphutasiddhanta
CĀryabhaṭa's Āryabhaṭīya (Chapter 2, Verse 19)
DMadhava's Yuktibhāṣā
Answer & Solution
Correct answer: C. Āryabhaṭa's Āryabhaṭīya (Chapter 2, Verse 19)
Per NCERT §8.5, Aryabhata (Aryabhatiya, Ch 2 V 19) gives the formula — also expressing it as 'average × number of terms'.
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