4,9,14,...qanday ketma-ketlik?, arifmetik progressiya, 25,21,17,... d=?, -4, 3,6,12,...qanday ketma-ketlik?, geometrik progressiya, a1=12, d=3, a11=?, 42, 25+32+...+60=?, 255, 4,1,1/4,... q=?, 1/4, 25,31,35,... progressiya bo'ladimi?, yo'q, 5,1,1/5,... yig'indini toping, 25/4, 1,12,15,26 ketma-ketlikning keyingi hadini toping, 29.

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