The 24th term of the A.p is twice its 10th term show that 72nd term is 4 times is 15th term
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a24 = 2a10
a + 23d = 2a +18d
a = 5d
Now, a72 = a + 71d = 5d + 71d = 76d
Now, a15 = a + 14d
4a15 = 4a + 56d = 4(5d) + 56d
= 20d + 56d = 76d
Therefore, a72 = 4a15
a + 23d = 2a +18d
a = 5d
Now, a72 = a + 71d = 5d + 71d = 76d
Now, a15 = a + 14d
4a15 = 4a + 56d = 4(5d) + 56d
= 20d + 56d = 76d
Therefore, a72 = 4a15
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