B= {xix is a
two digit natural number sum of whole digit is 7} write in roster form
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4
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
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