The middle two digits MN are referred to as the group number. The group number can be any number from 01 to 99 (it cannot be 00). The last 4 digits ABCD are the serial number. The serial number can be any from 0001 to 9999 (it cannot be 0000). Additionally, the number social security number 123-45-6789 is only used in advertisements. How many social security numbers are possible? SHOW YOUR WORK IN THE SIMPLES WAY

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

there would only be 50 odd numbers between 1 and 100 so therefor there would be 50 even so that would only be 50 odd numbers.