Question

help ! below ...

Write the series in summation notation:

-3 + 6 - 9 + 12 - 15

Answer 1

a) \[\sum_{k=0}^{4} \left( -1 \right)^{k} -1(3k)\]
b) \[\sum_{k=1}^{5} \left( -1 \right)^{k} (3k)\]
c) \[\sum_{k=1}^{5} \left( -1 \right)^{k} -1(3k)\]
d) \[\sum_{k=0}^{4} \left( -1 \right)^{k} (3k)\]

Answer 2

b

Answer 3

thanks @Fifciol