121. Sonli ketma-ketlikning n-hadini hisoblash II

Agar $a_{n} = 7 n^{2} - 4 n + 74$ , $b_{n} = - 9 a_{n}^{2} + 5 a_{n} + 53$ bo‘lsa, $b_{14}$ ning qiymatini kiriting.

Yechimni jo'natish uchun tizimga kirish lozim.

Tizimga kirish

Ushbu sahifaga havola: https://itboom.uz/m121/

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