Let A={x1,x2,x3,....,x7},B={y1,y2,y3}. The total number of functions f:A→B that are on to and there are exactly three element x in A such that f(x)=y2 is equal to
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Q4
Let A={x1,x2,x3,....x7},B={y1,y2,y3.} The total number of functions f:A→B such that every element in B has atleast one pre image and there are exactly three element x in A such that f(x)=y2 is equal to
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Q5
What is the n-factor or the valency factor of H2CO3?