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1)How many „words‟ can be formed using letter of STUDENT using

each letter at most once:

i) If each letter must be used,

ii) If some or all the letters may be omitted.

Show whether ( p→q) ( q → p ) is a tautology or not using truth

table.

1
they are two different questions....

some one has given a stupid answer now i know the answer but i cant give

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