

(10101)_2=(21)10


Given : Number (10101)_2(10101)2
To find : What is the value of (10101)_2(10101)2 in decimal number system?
Solution :
Decimal number system is a positional numeral system employing 10 as the base.
Now, to convert it into base 10
Multiply each digit of the following binary by the corresponding power of 2:
(10101)_2(10101)2
=1\times 2^4+0\times 2^3+1\times 2^2+0\times 2^1+1\times 2^0=1×24+0×23+1×22+0×21+1×20
=1\times 16+0\times 8+1\times 4+0\times 2+1\times 1=1×16+0×8+1×4+0×2+1×1
=16+0+4+0+1=16+0+4+0+1
=21=21
Therefore, (10101)_2=(21)_{10}(10101)2=(21)10
Answer:
1. =CONCATENATE(" John"," ","Smith")
2. =(" John"&" "&"Smith")
Explanation:
Given
Two separate strings; "John" and "Smith"
Required
2 separate formulas to concatenate both strings to form " John Smith"
There are several ways to concatenate strings in Microsoft Office Excel; one of the methods is using the concatenate function while the another method is using the traditional & operator.
Using the concatenate function, the formula is as follows
=CONCATENATE(" John"," ","Smith")
This function will combine the " John", " " and "Smith" to give a new string " John Smith" (without the quotes).
Using the traditional & operator may be a little bit difficult (and not frequently used) but the formula is as follows;
=(" John"&" "&"Smith")
The result will be the same as (1) above
The answer is B because it is short and simple and gets you to the point