Question

Complete the following activity to find the 19th term of the A.P. 10,15,20,….

Answer 1

Here a=10, `d= square , t_(19)= ?`
`t_(n) = a+ square `
`:. t_(19) = 10+ square`
`:. t_(19) = square `
Activity `:` Here , `a= 10 , d= 5, t_(19) = ?`
`t_(n) = a+ ( n -1) d `
`:. t_(19) = 10+ ( 19-1) xx 5 `
`:. t_(19) = 100`