Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Quantitative Aptitude Algebra Linear Equation in 2 or more Variables
If x + y + z = 28 and xy + yz + zx = 55, then what is the value of (x – y)2 + (y – z)2 + (z – x)2?
1
1238
2
1340
3
1330
4
More than one of the above.
5
None of the above