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Counting & Binomials
Access custom-built, exam-style problems for Counting & Binomials. Each problem has a full solution and mark-scheme, as well as AI grading and support.
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Expand (2x−3)4 in descending powers of x.
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In the expansion of (2x−a)6, the coefficient of x4 is 380.
Find the possible value(s) of a.
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In the expansion of (2x3+bx1)8, the coefficient of x12 is 28.
Find the value of b.
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Pascal is picking a 4 digit code, but decides that her code will either contain only even digits, or only odd digits, and that no digit will be repeated.
Find the number of possible codes.
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In the expansion of (2+3x3)n−2, the coefficient of x6 is 720.
Find the value of n.
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Write down the expansion for (1+x)4.
Bob puts $10000 in a bank that pays 10% interest.
Using your answer to (a), find to the nearest dollar the amount of money in Bob's account after 4 years.