Question
Download Solution PDFWhich of the following is an irrational number?
This question was previously asked in
Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
Answer (Detailed Solution Below)
Option 3 : √7 − 8
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Bihar STET Paper 1 Mathematics Full Test 1
150 Qs.
150 Marks
150 Mins
Detailed Solution
Download Solution PDFCalculations:
(√5 + 1) (√5 − 1) = 5 - 1 = 4 (By a2 - b2 = (a - b)(a + b) (rational number it is)
√7 − 8 = Irrational number
Hence, The Correct Answer is option 3.
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