In a real number line, the neighbourhood of positive real number ‘a’ with a very small radius δ>0 will be ____.
A. (a – δ, a]
B. [a, a + δ)
C. (a – δ, a + δ)
D. a sphere of radius a
Answer:A
In a real number line, the neighbourhood of positive real number ‘a’ with a very small radius δ>0 will be ____.
A. (a – δ, a] B. [a, a + δ) C. (a – δ, a + δ) D. a sphere of radius a