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Find the degree of the expression (1+x)(...

Find the degree of the expression `(1+x)(1+x^6)(1+x^(11))(1+x^(101))dot`

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The degree of the expression is 1+6+11+….+101 which is an A.P.
Now 101=1+5(n-1)
`rArrn=21`
`rArr1+6+11+…+101=21/2[1+101]=21xx51=1071`
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