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- Illustrations - lustration 21. Find the sum of given Arithmetic Progression 4 + 8 + 12 +.........+ 64 (1) 464 (2) 540 (3) 544 olution (4) 646 Here a = 4, d = 4, n = 16 So, sum 16 [First term + last term] = [4 + 64] = 8(68) = 544

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