Which of the following Venn diagrams corresponds to U−(B∩C)?

(2) Let S := {1, ..., n}. Compute the number of towers of length of the form Aj c A2 c S, where A1 + Ø, A + A2, and A2 + S.

Suppose you are given that A, B, C, D, E, F are points satisfying A ∗ B ∗ C, D ∗ E ∗ F, AB ≅ DE, andCB ≅ EF. Prove that AC ≅ DF. Be careful with notation, and justify all steps.

the proble. 1) In which scatter diagram is r = -1? a 12+ 12+ 10+ 10+ 8- 6+ 6+ 4+ 4- 2+ 2+ + 2 3 4 6. 1 3 4 6 d. 12- 12- 10+ 10+ 8+ 8- 6+ 6+ 2+ + + 1 3 4 6 1 3 4 5 6. 7 x 12 12- 10+ 10+ +8 6+ 4+ 4• 2+ 2 3 5 6. 7 x 1 3 6. а. d b. f С. b d. a