Question

B= {xix is a
two digit natural number sum of whole digit is 7} write in roster form​

Answer 1

Answer:

B = {16, 25, 34, 43, 52, 61, 70}

Step-by-step explanation:

B = {x : x is two digit natural number sum of whose digit is 7}

It can be written in roster form as given in answer because

1+6 = 7

2+5 = 7

3+4 = 7

4+3= 7

5+2=7

6+1=7

7+0=7

That's why we take

16, 25, 34, 43, 52, 61, and 70 as elements.

NOTE -

It is trick to find a roaster form of that type of given question.

Solved By

Aaditya Singh