Algebra (Railway Maths) (Part – VIII)

Total Questions: 50

1. If y = 26, then what is the value of y√(y³ - y²)? [RRB NTPC 11/02/2021 (Evening) ]

Correct Answer: (b) 3380
Solution:

2. Find the answer of given question? [RRB NTPC 12/02/2021 (Morning) ]

Correct Answer: (b) 5
Solution:

3. If (x − y)/3 = (x + y)/5 = xy/8, then find the value of xy. [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (b) 16
Solution:

4. If √x + (2/5) × 70 = 20 × (1/4) × 7, then the value of x is: [RRB NTPC 15/02/2021 (Morning)]

Correct Answer: (d) 49
Solution:

5. The sum of two numbers is 20 and the difference between their squares is 80. Select the two numbers from the given options. [RRB NTPC 15/02/2021 (Morning) ]

Correct Answer: (d) 12,8
Solution:

6. If x² − 1 is a factor of ax⁴ + bx³ + cx² + dx + e, then which of the following is a possible relation between the coefficients of powers of x? [RRB NTPC 15/02/2021 (Evening)]

Correct Answer: (a) a + c + e = b + d
Solution:

7. If x > 1 and x + 1/x = √29, what is the value of x − 1/x? [RRB NTPC 15/02/2021 (Evening)]

Correct Answer: (c) 5
Solution:

8. If (x + y) : (x − y) = 7 : 3, then find (x² + y²) : (x² − y²). [RRB NTPC 16/02/2021 (Morning)]

Correct Answer: (c) 29 : 21
Solution:

9. If 2x − 3y = 7 and x / (x + y) = 5/6, then what is the value of x − y? [RRB NTPC 16/02/2021 (Morning)]

Correct Answer: (a) 4
Solution:

10. If a = 3 + √5 / 3 - √5 and b = 3 - √5 / 3 + √5, then find the value of a² + b² - ab [RRB NTPC 16/02/2021 (Morning) ]

Correct Answer: (a) 46
Solution: