Question

if 1+4+7+······is than find the frist 20 term of AP​

Answer 1

Step-by-step explanation:

a=1

d=3

t20=a+19d

=1+19(3)

=1+57

=58

HOPE IT HELPS YOU..................

Answer 2

Answer:

a = 1

d = 3

n= 20

Step-by-step explanation:

an= a+(n-1) d

= 1+(20-1) * 3

= 1+19*3

= 1+57

=58

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