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Find the number of terms in the expansio...

Find the number of terms in the expansions of the following: `(3x+y)^8`

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For number of terms in any equation we have ` \ ^(n+r-1) C_n`
So we have
`=\ ^(8+2-1) C_8`
`=\ ^9 C_8`
`=9` terms
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