Question

Find the mentioned terms of given a.p .10,13,16,19,...........20th term

Answer 1

Answer:

a=10 ,d=3,n=20

a(n)=a+(n-1)d

=10+(20-1)3

=10+(19)3

=10+57

=67

therefore 67 is the answer

Answer 2

The 20th term of the given a.p is 67.

Given,

Series of a.p 10,13,16,19............

To Find,

The 20th term of a.p

Solution,
To find the nth term in a,p we will use the formula:

nth term = a+(n-1)d,

Whereas, a = first tem

              d = common difference

              n = term to find.

Let's solve the question using this formula

a = 10

d = second term - first term

= 13- 10 = 3

n = 20.

20th term = 10+(20-1)×3

20th term = 10+ 19 × 3

20th term = 10+57

20th term = 67.

The 20th term of the given a.p is 67.

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