1.

0.4 neighbourhood of 4:

Answer»

Here, a = 4; δ = 0.4

In Modulus form: |x – a| < δ

∴ N(4, 0.4) = |x – 4| < 0.4

In Interval form:(a – δ, a + δ)

∴ N(4, 0.4) = (4 – 0.4, 4 + 0.4)

= (3.6, 4.4)



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