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1, 6, 11, 16 ...... Find the 18th term of this A.P. - Algebra

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Sum

1, 6, 11, 16 ...... Find the 18th term of this A.P.

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Solution

The given A.P. is 1, 6, 11, 16, ......

Here, a = 1, d = 6 – 1 = 5

Since tn = a + (n – 1)d,

t18 = 1 + (18 – 1)(5)

= 1 + 17(5)

= 1 + 85

= 86

∴ 18th term of the given A.P. is 86.

Concept: Arithmetic Progression
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