If Sn denotes the sum of first …
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Rashmi Bajpayee 7 years, 2 months ago
R.H.S.
3[20/2{2a + (20 - 1)d} - 10/2{2a + (10 - 1)d]
= 3[10{2a + 19d - 5{2a + 9d}]
= 15[4a + 38d - 2a - 9d]
= 30/2[2a + 29d]
= 30/2[2a + (30 - 1)d]
= S30
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