Question

find the 21st term of the series -3+0+3+6+....​

Answer 1

Answer:

a+(n-1)×d

-3+ ( 21-1) × 3

-3 + (20 × 3)

- 3 + 60

= 57

Answer 2

Answer:

57

Step-by-step explanation:

a=-3

d=3

a+(n-1)d=an

-3+(21-1)3

=-3+20*3

=-3+60

57