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tip of a pin is made sharp so that it can easily penetrate any thing , from the fact that pressure = force / area , so when area in decreased pressure increases and the pin can go through any object . 

i hope it helps..................... 
2 5 2
pahi someone has copied ur answer :p
coping is not allowed here ...if some copies then his/her answers r to be reported
a person has given the same answer tht u hv given..
mne report kr di...:p
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