Let a and b be two nonzero real numbers. If the coefficient of x^5 in the expansion of (ax^2 + 70 27bx )^4 is...

Question

Let a and b be two nonzero real numbers. If the coefficient of x^5 in the expansion of (ax^2 + 70 27bx )^4 is equal to the coefficient of x^ -5 in the expansion of (ax - 1 bx^2 )^7, then the value of 2b is _____.

Accepted Answer

3

JEE Advanced 2023 Mathematics question

Solution

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