Write a formula for un, the nth term, for the following sequences. Show your working. [2 marks ea]
2, 5, 8, 11, …
6, 11, 16, 21, …
11, 8, 5, 2, …. .
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1 . Ans= Here the difference is 3 so it will be
3n-1 is the nth term formula.
Verification: 3×1-1= 2 , 3×2-1, 3×3-1, 3×4-1.
2 Ans= Here the difference is 5 so it will be
5n+1 is the nth term formula.
Verification: 5×1+1=6, 5×2+1=11 , 5×3+1=16, 5×4+1=21.
3 Ans. it is same as above means 1 answer only it has different method has opposite.
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