Question

1. Find the AP whose nth term is 7 - 3n. Also find the 20th term.​

Answer 1

Step-by-step explanation:

nth term = 7 - 3n

So,

$T_{1}$ = 7 - 3 x 1

    = 7 - 3

    = 4

$T_{2}$ = 7 - 3 x 2

    = 7 - 6

    = 1

$T_{3}$ = 7 - 3 x 3

    = 7 - 9

    = -2

A.P. is 4, 1, -2, ..........

$T_{20}$ = 7 - 3 x 20

     = 7 - 60

     = -53

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