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Find: nth term of the A.P. 13,8,3,-2,…...

Find: nth term of the A.P. 13,8,3,-2,…

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We have , `13,8,3,2.....`
Then first term (a)`=13`
Common difference (d)`=8-13=5`
:`t_n``=a+(n-1)d`
`T_n``=13+(n-1)``(-5)=13+n(-5)-1(-5)`
`13-5n+5`
`T_n``=18-5n`
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