Is it possible for a user as a newbie to send merits?
That is possible, but when you have at least 1 sendable merit (sMerit) when you open this link:
https://bitcointalk.org/index.php?action=meritIf yes, How many?
Minimum 1 and maximum 50 in 30 days for 1 user. You can also send to 1-1000 users or more on posts that you consider appropriate if you have a sendable merit (sMerit).
and how many can you receive as a Newbie?
Depends on the quality of your post. If you can post something useful then that post might be appropriately merit by other users.
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but I believe sending to a thread or post like OP is not a wise decision.
Maybe coupable want to prove to the OP that newbie can also receive merit from anyone, but maybe coupable do not send it on posts that deserve to be appreciated. 1 merit is a very small number, mate.
