Find the sum of the A.P.; 14, 21, 28, ......., 168.

Let 168 be n th term. ⇒ a n = a + (n - 1)d ⇒ 168 = 14 + (n - 1)7 ⇒ 168 = 14 + 7n - 7 ⇒ 168 = 7n + 7 ⇒ 161 = 7n ⇒ n = 23. Hence, n = 23 and sum = 2093.

Divide 216 into three parts which are in A.P. and the product of two smaller parts is 5040.

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Can 2n² - 7 be the n^th term of an A.P. Explain.

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The first term of an A.P. is 20 and the sum of its first seven terms is 2100; find the 31^st term of this A.P.

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Find the sum of last 8 terms of the A.P.
-12, -10, -8, …….., 58.

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Mathematics

Find the sum of the A.P.; 14, 21, 28, ……., 168.

AP

Related Questions

Divide 216 into three parts which are in A.P. and the product of two smaller parts is 5040.

Can 2n² - 7 be the n^th term of an A.P. Explain.

The first term of an A.P. is 20 and the sum of its first seven terms is 2100; find the 31^st term of this A.P.

Find the sum of last 8 terms of the A.P.
-12, -10, -8, …….., 58.

Mathematics

Find the sum of the A.P.; 14, 21, 28, ……., 168.

AP

Related Questions

Divide 216 into three parts which are in A.P. and the product of two smaller parts is 5040.

Can 2n2 - 7 be the nth term of an A.P. Explain.

The first term of an A.P. is 20 and the sum of its first seven terms is 2100; find the 31st term of this A.P.

Find the sum of last 8 terms of the A.P.-12, -10, -8, …….., 58.

Can 2n² - 7 be the n^th term of an A.P. Explain.

The first term of an A.P. is 20 and the sum of its first seven terms is 2100; find the 31^st term of this A.P.

Find the sum of last 8 terms of the A.P.
-12, -10, -8, …….., 58.