The sum of first n terms of three arithmetic progressions are S1, S2 and S3. Prove that S1+S3=2S2.

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The sum of first n terms of three arithmetic progressions are S_1, S_2 and S_3 respectively. The first term of each A.P. is 1 and common differences are 1, 2 and 3 respectively. Prove that S_1+S_3=2S_2.
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Awesome teaching + awesome background music

jitudewasi
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Good explanation
Very helpful
thank you

fortnightgamer
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Sir rhs me jab aapnr 2 n/2 kyo lika sir 🙏 please bta dijiye

lovekushranag
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But sir I found out the value of n and substituted and got answer as 4

SaqifRazviThembps
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Lower the background music.
But thanks

shaziya
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Why you have use n as s1 is given so you have to put n v a value as 1

anandrao
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What is wrong with the background music 💀

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