Question

Find the 20th term from the last term of the A.P. 3, 8, 13, …, 253​

Answer 1

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★Find the 20th term from the last term of the A.P. 3, 8, 13, …, 253

Solution:

In this Progression,

a(fist Term) = 3

d(common difference) =5

An(last term) = 253

→ To Find : 20th Term from last..

We can do so by reversing this A.P.

253,248,......,13,8,3

so, here

a= 253

d=-5

An=3

so, the 20th term in this A.P. will be

An = a + (n-1)d

20th term= 253+(20-1)(-5)

=253+(19)(-5)

=253-95

= 158

.

so, 158 is the correct answer✿

Answer 2

Answer:

Find the 20th term from the last term of the A.P. 3, 8, 13, …, 253

Solution:

In this Progression,

a(fist Term) = 3

d(common difference) =5

An(last term) = 253

→ To Find : 20th Term from last..

We can do so by reversing this A.P.

253,248,......,13,8,3

so, here

a= 253

d=-5

An=3

so, the 20th term in this A.P. will be

An = a + (n-1)d

20th term= 253+(20-1)(-5)

=253+(19)(-5)

=253-95

= 158

.

so, 158 is the correct answer✿

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