Which of the followng statements are true and which false?
`{1,2,7} sub {1,2,7}`

Let A = { 1, 2, { 3, 4 }. 12 }. Which of the following statements are incorrect and why? {1, 2, 3} sub A

Let A = { 1, 2, { 3, 4 }. 10 }. Which of the following statements are incorrect and why? {1, 2, 5} sub A

Let A = { 1, 2, { 3, 4 }. 5 }. Which of the following statements are incorrect and why? {3, 4} sub A

Let A = { 1, 2, { 3, 4 }. 7 }. Which of the following statements are incorrect and why? {{3,4}} sub A

Which one of the followng is true ?

Let A = { 1, 2, { 3, 4 }. 9 }. Which of the following statements are incorrect and why? 1 sub A

Let A = { 1, 2, { 3, 4 }. 15 }. Which of the following statements are incorrect and why? {phi} sub A

Which of the following statements are True (T) and which are False(F)? The whole number 1 has two predecessor in whole numbers.