Question

The sum of 20 terms of an ap is 820 . If the first term is 3 , then find the common difference

Answer 1

Answer:i dont know

Step-by-step explanation:

Answer 2

Answer:

Common Difference is 4

Step-by-step explanation:

Given,

Sum = 820

First Term = 3

Let the Common Difference be d,

ATP,

S = $\frac{n}{2}${ 2a + (n-1) d}

820 = $\frac{20}{2}${6 + (19)d}

82 = 6 + 19d

76 = 19d

4 = d