SOLUTION: 61st term of the sequence if a↓4=8 and a↓21=26? 73rd term of the sequence if a↓1=18 and a↓18=52?

SOLUTION: 61st term of the sequence if a↓4=8 and a↓21=26? 73rd term of the sequence if a↓1=18 and a↓18=52?

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Question 1085358: 61st term of the sequence if a↓4=8 and a↓21=26?
73rd term of the sequence if a↓1=18 and a↓18=52?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
I'll do one, you do the next.
1.
2.
Subtracting,

and

.
.
So then,

.
.
.
Do the next one the same way.

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