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RELATIONS AND FUNCTIONS — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsRELATIONS AND FUNCTIONS1 Mark
MCQ
A constant function f : A → B will be one-one if:
  • A
    n(A) = n(B)
  • ✓
    n(A) = 1
  • C
    n(B) = 1
  • D
    n(A) < n(B)
✓

Answer

Correct option: B.
n(A) = 1
Given f is a constant functions.

⇒ range of f is {c}(say)

Since f is one-one

⇒ domain of A should also contain

one element.

$\therefore\text{n(A)}=1$

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