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Collinearity Condition

Find the sum ...

Question

Find the sum of A.P. – 1 + 5 + 9 + 13 + 17 + 21 + 25 = .

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Solution

$S u m o f n t e r m s o f a n A . P . = \frac{n [2 a + (n - 1) d]}{2}, a = 1, n = 7, d = 4.$

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Collinearity Condition

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