If the coefficient of x15 in the expansion of (ax3+bx311)15 is equal to the coefficient of x−15 in the expansion of (ax31−bx31)15, where a and b are positive real numbers, then for each such ordered pair (a,b):
Held on 30 Jan 2023 · Verified 6 Jul 2026.
a=b
ab=1
a=3b
ab=3
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