Question

18. Find the sum of first 20 terms of A.P. 3, 7, 11, 15 .... using the formula.​

Answer 1

Answer:

A=3

Common Difference=4

a+(n-1)d

3+(20-1)4

=79 is the 20th Term...

Have A Nice Day..Mate..GM

Answer 2

Step-by-step explanation:

hope it helps u dear...... the answer for sum of 20 terms are 820✌️✌️