sinf agar va bo‘lsa, ning qiymatini toping. A b c d agar arifmetik progressiyada, bo‘lsa, uning dastlabki o‘n ikki hadi yig‘indisini toping. A b c d agar geometrik progressiyada, va bo‘lsa, uning hadlari soni ni toping

D	B	B
D
11Q	12M	13B	14B	15Q	16Q	17Q	18Q	19Q	20M
D	C	A	B	C	B	B	D	B	A