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RRB Technician Grade 1 Model Paper 1

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Question : 48 of 100

Marks: +1, -0

28^{th}

term of A.P given by

11, 15, 19, 23

_________ is

105
119
113
125

Solution:

Concept:

The

n

th term of an arithmetic progression is found using

a_n = a + (n-1)d

.

Explanation:

Here, the first term is

a = 11

.

The common difference is

d = 15 - 11 = 4

.

We need the

28

th term, so

n = 28

.

Substitute into the formula:

a_{28} = 11 + (28 - 1) \times 4

a_{28} = 11 + 27 \times 4 = 11 + 108 = 119

Answer:

The

28

th term is

119

, which matches option B.

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