Question

Find the 21st term of the AP-7/2,-3,1/2

Answer 1

Answer:

Step-by-step explanation:

The 21st term is 51/2

Solution:

Given that,

The arithmetic sequence is:

Find the common difference between a term and its previous term

The nth term in an AP is given as:

Where,

n is the nth term

d is the common difference

is the first term

Find the 21st term:

Substitute

Therefore,

Thus 21st term is found

Answer 2

Answer:

d1 is not equal to d2

d1=-3-(-7/2)=1/2

d2=1/2-(-3)=7/2

so, this is not in A.P.

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