Question

find the 21st term of series 4, 7, 10.....​

Answer 1

Answer:

in this general formula would use a+(n-1)d

Answer 2

Answer:

given series 4,7,10......

a1=4 , a2=7, a3=10

finding common difference

d=a2-a1

=7-4

=3

therefore the d=3

finding the 21st term

a21=a+29d

=4+29(3)

=4+87

=91

THERE FORE THE 21ST TERM IS 91