Try some maths questions that give you1-2 marks in the upcoming RRB NTPC exam as well as the RRC group d exam.
1. If x + 1 / x = 3 find x^2 + 1/x^2 = ?
Ans: P^2 - 2 ( P = 3 )
= 3^2 -2
= 9 - 2 = 7
2. If x +1/x =9 find x^3 + 1/x^3 = ?
Ans: P^3 - 3P
= 9^3 - 3 * 9 = 729 - 27 = 702
3. If x +1/x = 5 find x^4 + 1/x^4 = ?
Ans: P^4 - 4P^2 + 2= 625 - 100 + 2 = 527
4. If x +1/x = 2 find x^5 + 1/x^5 = ?
Ans : P^5 - 5P^3 + 5P
= 2 ^5 - 5*2^3 +5*2
= 32 - 4 + 10 = 32+6 = 38
5 If x +1/x = 2 find x - 1/x = ?
| Ans = √ P^2 - 4 = 2^2 -4 = 4 - 4 = 0 |
6. If x - 1/x = 2 find x^2+ 1/x^2 = ?
Ans : P^2+ 2
= 2^2 +2 = 4+2 = 6
7. If x - 1/x = 3 find x^3 - 1/x^3 = ?
Ans : P^3 + 3P
= 3^3 +3*3 = 27 + 9 = 36
8. If x - 1/x = 2 find x^4+ 1/x^4 = ?
Ans : P^4 +4P^2 +2
= 2^2 +4*2^2 +2 = 4+16+2 =22
9. If x - 1/x = 2 find x^5 - 1/x^5 = ?
Ans : P^5 +5P^2 +5P
= 2^5 + 5*2^2 +5*2 = 32 +20 +10 =62
