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If sum ( r =1)^(100) r . (""^(100) C (r)...

If `sum _( r =1)^(100) r . (""^(100) C _(r)) ^( 2) = 50. ""^(x) C _(100),` then value of x is

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NTA MOCK TESTS-NTA TPC JEE MAIN TEST 79-MATHEMATICS
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