Math, asked by ammua1567, 11 months ago

find the sum of first
20 terms of AP 3, 7, 11, 15 using the formula

Answers

Answered by shetriyas

7

Answer:

820

Step-by-step explanation:

a = 3

d = 4

S = n/2[2a+(n-1)d]

S = 10[6+19×4]

S = 820

Answered by harshadakhedekar

1

Answer:

Step-by-step explanation:

T1=a=3,d=5 tn=20

Formula=tn=a+(n-1)d

=20=3(20-1)5

=20=285

=285-20

=265

tn=265

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