Teaching DSSSB PGT Mock Test 2025 Mathematics Relations and Functions Domain of a Function

निम्नलिखित फलन का डोमेन और परास ज्ञात कीजिये। f(x) = 1/√(x - 4).

1
D = R
2
[- ∞, ∞), (- ∞, ∞)
3
कोई नहीं
4
(4, ∞),  (- ∞, ∞)
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