In mathematics, the intersection of two sets A and B, denoted by A ∩ B, is the set containing all elements of A that also belong to B (or equivalently, all elements of B that also belong to A).

1 : a unifying bond : link, tie. 2 : a straight horizontal mark placed over two or more members of a compound mathematical expression and equivalent to parentheses or brackets about them.

Now multiply the numbers on the right hand side (-1 and -3 ) to get 3 as the last digit of the product. Add the two numbers on the left (9 and 7) to get 16 and subtract the nearest power of 10 (10 in this case) from it to get the next digit (to get 6). So. This method is called ‘Nikhilam’.

The bar over a set is another notation for the complement of a set. For example: Where U is the universal set. Remember that the complement of C is the set of all elements not in C, in other words, everything in the Universe that isn’t in C.

The C with bar (majuscule: Ꞓ, minuscule: ꞓ), also known as barred C, is a modified letter of the Latin alphabet, formed from C with the addition of a bar.

Option 2: Create your own

1. Go to the Insert tab > Symbols group (far right), then click Equation.
2. Select Insert New Equation from the bottom of the list.
3. Type D in the equation box, then select it.
4. Click Accent on the Design tab > Structures group.
5. Click the Bar icon.
6. Click in the dashed box, then type D.

The first character to appear in the middle display is the combining macron. With your insertion point still behind the number (or letter) that you typed — double-click the combining macron symbol in the middle character panel. The number will instantly receive a macron (bar) above it.

To enter an ASCII code, all you have to do is hold down your Alt key while typing out a numeric code on your number pad. For example, the code for a lowercase letter “a” with a grave accent is 133. So, you’d hold down Alt, type 133, and then let go of the Alt key. As soon as you do, the character appears—voilà!