Question

If 10th term is 200 and 20th term is 100 find common difference

Answer 1

Step-by-step explanation:

Let common difference be d.

a10 = 200; a20 = 100;

Using

an = a + ( n-1)d

a10 = a + (10 - 1) d

200 = a + 9d......... equation 1

Also,

a20 = a + 19d

100 = a + 19d......... equation 2

Subtracting equation 1 and 2, we get

100 = -10d

So common difference, d= -10

Hope you get this one.....

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