Which of the following is not correct? 

The smallest natural number and smallest whole number are respectively 

Study the following pattern:

$1=\frac{1\times 2}{2}, 1+2=\frac{2\times 3}{2}, 1+2+3=\frac{3\times 4}{2}$ 

By observing the above pattern, the value of $1+ 2+ 3+ 4+ 5+ 6+ 7+ 8+ 9+ 10$ is 

The whole number which does not have a predecessor is 

$1, 3, 6, 10, 15, 21$ are all triangular numbers. 

If $\text{'}a\text{'} \text{and} \text{'}b\text{'}$are any two whole numbers such that $a>b$, then for any other whole number $c, (a+c)>(b+c)$. 

Every whole number is a natural number.