Test matematika progressiya 1

17.Dastlabki 5 ta hadining yig’indisi 242 va mahraji 3 ga teng geometrik progressiyaning 4- hadini toping. A) 486 B) 162 C) 54 D)27
18.02+a³+…=8a bo’lsa a ni toping.

A) 0,25 B) 125 C) 0,75 D) 0,875

19.-2, 3t-2, 3t-14 sonlari kamayuvchi geometrik progressiyaning ketma-ket 3ta hadlari bo’ladigan t ning barcha qiymatlari yig’indisi yoki t ning qiymatini toping. A) -7 B)-5 C)2 D) -4/3
20.Agar arifmetik progressiyada a₂+a₅–a₃ =10 va

a₁+a₆ =17 bo’lsa uning o’ninchi hadini toping.

A) 24 B)26 C)28 D)29
21.O’suvchi arifmetik progressiyaning dastlabki uchta hadining yig’indisi 24 ga teng. Shu progressiyaning ikkinchi hadini toping.

A) 8 B) aniqlab bo’lmaydi C) 10 D) 6