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Sequences and Binomial Expansions

3. Write the first four terms of the defined sequence
a lower case 1 = 1
a lower case n=na lower case n-1, n>1

9. Write the following in summation notation 3+6+9+12+15

10. Write the following in summation notation:
x+x^2/2 + x^3/6 + x^4/24

14. Find the fifth term in the expansion of (a + b)^16

15. Write the binomial expansion of (3x-5y)^4

16. Write the first three terms in the binomial expansion of (2x^5 + 3t^2)^12

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Sequences and Binomial Expansions are investigated. The solution is detailed and well presented.