1.

If(1 +x + x^(2) + …+ x^(9))^(4) (x + x^(2) + x^(3) + … + x^(9))= sum_(r=1)^(45) a_(r) x^(r)and the value ofa_(2) + a_(6) + a_(10) + … + a_(42) " is " lambda the sum of all digits oflambdais .

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ANSWER :9


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