Question

Write the formula to calculate last term of Ap series *

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Answer 1

Answer:

$\large{\boxed{\sf{\blue{a_{n} = a + (n - 1)d}}}}$

How to use it?

Question) An AP consists 10 terms and 2 is the first term of it, also common difference is 3, Find the last term of AP.

SoluTion:

Given:

• a = 2
• d = 3
• n = 10

To find:

• $\sf{a_n}$

Putting the values in above formula:

$\longrightarrow$ $\large{\sf{a_{n} = a + (n - 1)d}}$

$\longrightarrow$ $\large{\sf{a_{n} = 2 + (10 - 1)3}}$

$\longrightarrow$ $\large{\sf{a_{n} = 2 + (9)3}}$

$\longrightarrow$ $\large{\sf{a_{n} = 2 + 27}}$

$\longrightarrow$ $\large{\sf{a_{n} = 29}}$

Hence, last term of AP will be 29.

That's how we use it.

Answer 2

Answer:

the formula to calculate the last term is

Tn =a+(n-1)*d

Step-by-step explanation:

hope this helps you