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Question-111937

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Question Number 111937 by bemath last updated on 05/Sep/20
Answered by bobhans last updated on 05/Sep/20
let the first five question is number : 1; 2; 3; 4; 5 case(1) ⇒ C _4^5 × C _4^5 = 25 case(2)⇒ C _5^5 × C _3^5 = 1×10=10 totally 25 +10 = 35.
letthefirstfivequestionisnumber:1;2;3;4;5case(1)⇒C45×C45=25case(2)⇒C55×C35=1×10=10totally25+10=35.

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