Question

Find the first four terms if the nth term of A.P is 2n+5

Answer 1

Step-by-step explanation:

Given AP is :

$t_n = 2n + 5 \\ now \: let \: us \: put \: n \: = 1 , 2 , 3 \: and \: 4 , \\ we \: find \\ t_1 = 2 \times 1 + 5 = 2 + 5 = 7\\ t_2 = 2 \times 2 + 5 = 4 + 5 = 97\\ t_3 = 2 \times 3 + 5 = 6 + 5 = 11\\ t_4 = 2 \times 4 + 5 = 8 + 5 = 13 \\ hence \: first \: four \: terms \: of \\ \: given \: AP \: are \: 7, \: 9, \: 11, \: 13.$