Question

ifSN=3n2+4n then d=​

Answer 1

Answer:

6

Step-by-step explanation:

put n = 1

So, S1 = 3(1)²+4(1)

= 7

So, the first term is 7.

Put n= 2

S2 = 3(2)²+4(2)

= 12+8

= 20

So, 20 is sum of two terms.

first term + second term = 20

7+ second term = 20

second term = 13

common difference d = second term- first term

= 13-7

= 6