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Questions  

The remainder when 7128 is divided by 10 is

a
1
b
3
c
7
d
9

detailed solution

Correct option is A

7128−7264−(50−1)64−(1−50)64=1+∑k=164 64Ck(−50)kThus, remainder when  7128 is divided by 10 is 1.

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The coefficient of x7 in the expression (1+x)10+x(1+x)9+x2(1+x)8++x10 is


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