If the coefficients of x7& x8 in the expansion of [2+x/3]n are equal then the value of n is???

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Grade 12Algebra

If the coefficients of x⁷& x⁸ in the expansion of [2+x/3]ⁿ are equal then the value of n is???

Mostafijur Rahaman

11 Years agoGrade 12

1 Answer

Sourabh Singh

Approved Tutor Answer11 Years ago

$\binom{N}{7}$ (2)7(1/3)^{n-7 =(2)8(1/3)N-8

Use this equation to solve the question for the asked value of N.A linear equation will be formed in n WHICH WILL BE VERY EASY TO SOLVE .}

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If the coefficients of x7& x8 in the expansion of [2+x/3]n are equal then the value of n is???

Mostafijur Rahaman

1 Answer

Sourabh Singh

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