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[" 3.The first and last term of an AP ar...

[" 3.The first and last term of an AP are "a" and "l" and sum of the AP is "S" ,then the common "],[" difference is "(I^(2)-a^(2))/(k-(l+a))." Here "k" is equal to "],[[" (a) "S," (b) "2S," (c) "3S," (d) None of these "]]

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