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JEE Main 29 June 2022 Shift 2 Solved Paper

Section: Mathematics
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Question : 27 of 90
 
Marks: +1, -0
Let the coefficients of x−1 and x−3 in the expansion of (2x‌
1
5
−‌
1
x‌
1
5
)15,x>0, be m and n respectively. If r is a positive integer such that mn2=‌15Cr⋅2r, then the value of r is equal to___
[29-Jun-2022-Shift-2]
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