1.

Thesum ofthe coefficients inthe expansionof( 1 +x + x ^ 2 )^nis

Answer»

2
` 2^N `
`3^n `
`4 ^ n `

Solution :Toobtain sum OFCO- efficientsofbinomialexpansion,substitute`X = 1 `intheexpansion
`THEREFORE`sumofco -efficient`= (1+ 1+ 1) ^n `
`= 3^n `


Discussion

No Comment Found

Related InterviewSolutions