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Q.

If p is an integral multiple of 4 lying in between the coefficients of x4 and x in the expansion of x2+1x8, then the number of such values of p is

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a

6

b

3

c

4

d

5

answer is A.

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Detailed Solution

Coeff  x4,  r=8(2)-43=123=4

Coeff x,   r=8(2)-13=5

                C5  8<P<C4  8 56<P<70

Multiples of 4 in (56, 70)

       = 60, 64, 68

Required number = 3

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