Solve Q.IV)1 from the picture i.e. For an A.P.........................
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Mathexpert:
You have considered S_7 as 7th term but it should be sum of first 7 terms.
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Given a = 6 and S7 = 105
That means, 7th term = 24
a + 6d = 24
6 + 6d = 24
1 + d = 4
d = 3
......(1)
.....(2)
Now, from equations (1) and (2)
That means, 7th term = 24
a + 6d = 24
6 + 6d = 24
1 + d = 4
d = 3
......(1)
.....(2)
Now, from equations (1) and (2)
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