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Q.

Let (2x2+3x+4)10=r=020arxr  where a0,a1,a2a20  are constants, then the value of a7a13 is____
 

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answer is 8.

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Detailed Solution

(2x2+3x+4)10=r=020arxr

Replace x2x, (8x2+6x+4)10=r=020ar(2x)r.
 210x202x2+3x+410=r=020ar2r1xr

210r=020arxr=r=020ar2rx20r

Coefficient of  x7 is 210a7=a13213a7a13=8

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Let (2x2+3x+4)10=∑r=020arxr  where a0,a1,a2−−−a20  are constants, then the value of a7a13 is____