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 answer:

a62 =  482
s71 =  39760

Step-by-step explanation:

a71=455;d=3 a71=a1+(711)d 455=a1+(711)(3) a1=455(210)=665  a62=a1+(621)d=665+61(3)=482

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