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Find the 4 th term in the expansion of 
(x+2y)^(6) in simplest form.
Answer:

Find the 44 th term in the expansion of (x+2y)6 (x+2 y)^{6} in simplest form.\newlineAnswer:

Full solution

Q. Find the 44 th term in the expansion of (x+2y)6 (x+2 y)^{6} in simplest form.\newlineAnswer:
  1. Apply Binomial Theorem: To find the 4th4^{\text{th}} term in the expansion of (x+2y)6(x+2y)^{6}, we will use the binomial theorem. The binomial theorem states that the nthn^{\text{th}} term in the expansion of (a+b)m(a+b)^{m} is given by the formula C(m,k)amkbkC(m, k) \cdot a^{m-k} \cdot b^k, where C(m,k)C(m, k) is the binomial coefficient "mm choose kk". For the 4th4^{\text{th}} term, kk will be (x+2y)6(x+2y)^{6}00 because the first term corresponds to (x+2y)6(x+2y)^{6}11.
  2. Calculate Binomial Coefficient: We calculate the binomial coefficient for the 4th4^{\text{th}} term, which is C(6,3)C(6, 3). This is equal to 6!3!×(63)!\frac{6!}{3! \times (6-3)!}, where “!“\text{“!“} denotes factorial.
  3. Simplify Factorials: Calculating the factorials, we get 6!=6×5×4×3×2×16! = 6 \times 5 \times 4 \times 3 \times 2 \times 1, 3!=3×2×13! = 3 \times 2 \times 1, and (63)!=3!=3×2×1(6-3)! = 3! = 3 \times 2 \times 1. Substituting these into the binomial coefficient formula, we have C(6,3)=6×5×43×2×1C(6, 3) = \frac{6 \times 5 \times 4}{3 \times 2 \times 1}.
  4. Calculate Binomial Coefficient: Simplifying the binomial coefficient, we get C(6,3)=6×5×43×2×1=20C(6, 3) = \frac{6 \times 5 \times 4}{3 \times 2 \times 1} = 20.
  5. Calculate Powers: Now we need to calculate the rest of the term, which is x(63)×(2y)3x^{(6-3)} \times (2y)^3. This simplifies to x3×(2y)3x^3 \times (2y)^3.
  6. Simplify Powers: Calculating the powers, we get x3×(2y)3=x3×8y3x^3 \times (2y)^3 = x^3 \times 8y^3, since (2y)3=23×y3=8y3(2y)^3 = 2^3 \times y^3 = 8y^3.
  7. Multiply Coefficients and Powers: Multiplying the binomial coefficient by the calculated powers, we get the 44th term: 20×x3×8y320 \times x^3 \times 8y^3.
  8. Simplify Final Term: Simplifying the expression, we get the 44th term in simplest form: 160x3y3160x^3y^3.

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