# AS sequence

In an arithmetic sequence is given the difference d = -3 and a71 = 455.

a) Determine the value of a62
b) Determine the sum of 71 members.

Correct result:

a62 =  482
s71 =  39760

#### Solution:

${s}_{71}=71\cdot \frac{{a}_{1}+{a}_{71}}{2}=71\cdot \frac{665+455}{2}=39760$

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