Q. 2

# If 9 times the 9<

Given : 9 × (9th term) = 13 × (13th term)

To prove: 22nd term is 0

9 × (a + 8d) = 13 × (a + 12d)

9a + 72d = 13a + 156d

- 4a = 84d

a = - 21d …..Equation 1

Also 22nd term is given by

a + 21d

Using equation 1 we get

- 21d + 21d = 0

Hence proved 22nd term is 0.

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