Sum 15 term is 570 and 12tg term is 62 then what is common difference?
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Answer:
S¹⁵ = 570
n/2 [2a + (n-1)d] = 570
15/2 [2a + (15-1)d = 570
15/2 [2a + 14d] = 570
15[a + 7d] = 570
a + 7d = 570/ 15
a + 7d = 38 eqn 1
a¹² = 62
a + 11d = 62 eqn 2
subtract 1 from 2
4d = 24
d = 6
common difference = 6
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