Q.

If 2a+2b+3c=15 and a,b,c>0, then maximum value of term independent of x in the expansion of abx1/2+cx1/325 is

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a

 25C1012535

b

 25C1513535

c

 23C15(35)25

d

 25C10

answer is C.

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Detailed Solution

Tr+1=25Cr(ab)(25r)x25r2crxr3r=15=25C15a10b10c1510a+10b+15c=1(a+a++a)+(b+b+..+b)+(c+c+.+c)35a10b10c1513513535a10b10c15

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If 2a+2b+3c=15 and a,b,c>0, then maximum value of term independent of x in the expansion of abx1/2+cx−1/325 is