MathsJEE Main 6 Apr 2026, Shift 2·Q22·Numerical·Moderate

Binomial Theorem · Binomial expansion coefficients

\left(1 - x^3\right)^{10} = \displaystyle\sum_{r=0}^{10} a_r x^r (1 - x)^{30-2r}

, then

\dfrac{9a_9}{a_{10}}

is equal to .

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