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The sum of the 2nd and 5th terms of an A. P is 42 if the difference between the 6th and 3rd terms is 12 find the a. First term and 29th term ?
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Mar 21
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#mathematics
#algebra
#arithmetic-progression
The sum of the 2nd and 5th terms of an A. P is 42 if the difference between the 6th and 3rd terms is 12 find the a. First term and 29th term ?
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Mar 21
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Let the first term of the A.P be 'a' and the common difference be 'd'.
The 2nd term = a + d
The 5th term = a + 4d
The 6th term = a + 5d
The 3rd term = a + 2d
Given that the sum of the 2nd and 5th terms is 42:
(a + d) + (a + 4d) = 42
2a + 5d = 42
Given that the difference between the 6th and 3rd terms is 12:
(a + 5d) - (a + 2d) = 12
3d = 12
d = 4
Substitute d = 4 into the first equation:
2a + 5(4) = 42
2a + 20 = 42
2a = 22
a = 11
Therefore, the first term is 11 and the common difference is 4.
To find the 29th term:
29th term = a + 28d
29th term = 11 + 28(4)
29th term = 11 + 112
29th term = 123
Therefore, the 29th term is 123.
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