Question

the 14th term of Ap is zero. prove that 25th term of Ap is three times its 11th term

Answer 1

a14 = a + 13d
a14 = 0
a + 13d = 0
a = -13d ---------- ( 1 )
a25 = n ( a11 )
a + 24d = n ( a + 10d )
-13d + 24d = n ( -13d + 10d )
9d = n ( -3d )
n = 3



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Answer 2

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