defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Trigonometry Trigonometric Functions

Where does the function f(x) = \(\displaystyle\sum_{j=1}^7\)(x − j)2 attain its minimum value ?

1
x = 3.5
2
x = 4
3
x = 4.5
4
x = 5
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