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MathsMediumMCQ2025 Β· 24 Jan Shift 1

Q5. For some n β‰ 10, let the coefficients of the 5 th, 6 th and 7 th terms in the binomial expansion of (1 + x)n+4 be in A.P. Then the largest coefficient in the expansion of (1 + x)n+4 is: (1) 20 (2) 10 (3) 35 (4) 70

What This Question Tests

This question requires applying the condition for a system of linear equations to have infinitely many solutions, involving the determinant of the coefficient matrix and other related determinants.

Concepts Tested

System of linear equationsInfinitely many solutions (determinant and adjoint criteria)Cramer's rule/Rank method

Formulas Used

For infinitely many solutions, Det(A)=0 and Det(A_x)=Det(A_y)=Det(A_z)=0

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