b)What are rules to enter a function?
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ᴛʜᴇ ʀᴜʟᴇs ᴛᴏ ᴇɴᴛᴇʀ ᴀ ғᴜɴᴄᴛɪᴏɴ ᴀʀᴇ:
- ᴀʟʟ ᴇxᴄᴇʟ ғᴜɴᴄᴛɪᴏɴs ᴍᴜsᴛ ʙᴇɢɪɴ ᴡɪᴛʜ = sɪɢɴ.
- ғᴜɴᴄᴛɪᴏɴ ɴᴀᴍᴇ ᴍᴜsᴛ ʙᴇ ᴀ ᴠᴀʟɪᴅ ᴇxᴄᴇʟ ɴᴀᴍᴇ. ғᴏʀ ᴇxᴀᴍᴘʟᴇ: sᴜᴍ, ᴀᴠᴇʀᴀɢᴇ.
- ғᴜɴᴄᴛɪᴏɴ ɴᴀᴍᴇ ᴍᴜsᴛ ʙᴇ ғᴏʟʟᴏᴡᴇᴅ ʙʏ ᴀɴ ᴏᴘᴇɴɪɴɢ ᴀɴᴅ ᴄʟᴏsɪɴɢ ᴘᴀʀᴇɴᴛʜᴇsɪs.
- ᴀʀɢᴜᴍᴇɴᴛs ᴀʀᴇ ᴇɴᴄʟᴏsᴇᴅ ɪɴ ᴛʜᴇ ᴘᴀʀᴇɴᴛʜᴇsɪs. ғᴏʀ ᴇxᴀᴍᴘʟᴇ, =sᴜᴍ (ᴀ1:ᴀ5) .
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