Question

In an A.P. the difference between its 20 and 30th terms is 40, the 18 find the common difference.​

Answer 1

Answer:

Step-by-step explanation:

Let us consider, the Arithmetic Progression series be a1, a2, a3, a4, a5 …

a1 = a = 10

a2 = a1+d = 10+10 = 20

a3 = a2+d = 20+10 = 30

a4 = a3+d = 30+10 = 40

a5 = a4+d = 40+10 = 50

And so on…

Therefore, the A.P. series will be 10, 20, 30, 40, 50 …

And First four terms of this A.P. will be 10, 20, 30, and 40.

Answer 2

Answer:

common difference:4

Step-by-step explanation:

wkt,

Tn=a+(n-1)d

T30=a+29d

T20=a+19d

T30-T20=40

10d=40

d=4