Question

4. If the fifth term of an AP is zero, show that its 33rd term is four times its 12 th term

Answer 1

Given that fifth term of AP = 0

=> a + 4d = 0

=> a = -4d

_____________________

12th term = a + 11d = -4d + 11d = 7d

33rd term = a + 32d

= -4d + 32d

= 28d

= 4 × 7d

= 4 × 12th term (proved)

Answer 2

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