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What powers of xxx are included in the first four terms of an expansion?
A
n(n−1)2!\frac{n(n-1)}{2!}2!n(n−1)
B
x0x^0x0, x1x^1x1, x2x^2x2 and x3x^3x3.
C
The infinite expansion of (a+bx)n(a+bx)^n(a+bx)n requires ∣bxa∣<1\boxed{\left|\frac{bx}{a}\right|\lt1}abx<1.
D
4!=4⋅3⋅2⋅1=244!=4\cdot3\cdot2\cdot1=244!=4⋅3⋅2⋅1=24.
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3.4.1 Sequences and Series (A-level only) Flashcards
22 flashcards on WJEC A Level Maths 3.4.1 Sequences and Series (A-level only): the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.