यदि \(\left| {\overrightarrow a } \right| = 5\), \(\left| {\overrightarrow a - \overrightarrow b } \right| = 8\) और \(\left| {\overrightarrow a + \overrightarrow b } \right| = 10\), तो \(\left| {\overrightarrow b } \right|\) का मान है:
1
1
2
√57
3
3
4
√42