15. With which number 8/21 is
multiplied so that the product
becomes 1 ?
1
0
-8/21
21/8
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ᴡʜᴇɴ 21/8 ɪs ᴍᴜʟᴛɪᴘʟɪᴇᴅ ᴛᴏ ᴛʜɪs ɴᴜᴍʙᴇʀ ᴛʜᴇɴ ᴛʜᴇ ᴘʀᴏᴅᴜᴄᴛ ʙᴇᴄᴏᴍᴇ 1.
ʜᴏᴘᴇ ɪᴛs ʜᴇʟᴘs ᴜʜ~
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