engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Quantitative Aptitude Algebra Identities

যদি x + y + z = 9 এবং xy + yz + zx = 20 হয়, তাহলে x2 + y2 + z2 এর মান কত?

1
80
2
24
3
15
4
41
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