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Find the sum of 2n terms of the series w...

Find the sum of `2n` terms of the series whose every even term is `' a '` times the term before it and every od term is `' c '` times the term before it, the first term being unity.

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  17. If pth, qth , rth and sth terms of an AP are in GP then show that (p-q...

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  18. If second third and sixth terms of an A.P. are consecutive terms o a ...

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  19. Find an AP of distinct terms whose first term is unity such that the s...

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