Answers

2015-06-10T11:47:14+05:30
Let x =  5^{20}
Taking logarithm on both sides
⇒ logx = log  5^{20}
⇒logx = 20log 5
⇒logx = 20(0.699)       where log5 = 0.699 
⇒logx = 13.98
⇒ The characterstic of x is 13
⇒ The characterstic of  5^{20}  is 13

Therefore, the number of digits in  5^{20} is 14.
0
you cant consider value of log5 as it is not given in the question