Find the ones place of square of $$56^2$$.

The LCM of the prime numbers between 1 to 12 is .........

Select the appropriate combination of symbols that when sequentially placed in place of the question marks (?) in the given equation will correctly complete the equation.
$$((20?100)?4)?10 = -10$$

Replace # sign with the mathematical operators `+', `$$\div$$' and `—' and `=' to get a balanced equation out of (27 # 15 # 2) # 10 # 4. Choose the right sequence from below.

The mean deviation of the data 2, 9,9, 3, 6, 9, 4 from the mean is: