. Which is the first number in the `30^(th)` row?

Which is the last number in the 30^(th) row?

. What is the sum of all terms in the first 30 rows ?

Observe the number pattern made using terms of an arithmetic sequence 2, 6,10, ... . Find the first and the last numbers in the 20th line.

Write the first and the last numbers of the 10^(th) line.

Observe the number pattern made using terms of an arithmetic sequence 2, 6,10, ... . Which term of the arithmetic sequence 2, 6,10, ... is the last number of the 20th row of the above pattern.

There ạre 20 terms in an arithmetic sequence. Sum of the first and last term is 88 : a) What is the sum of the 2^(nd) and 19^(th) terms? b) If the 10^(th) term is 42 , what is the 11^(th) term? c) Whạt is the common difference of the sequence? d) What is the first term?

The sum of first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171 a) What is the sum of its 10^(th) to 18^(th) terms? b) What is its 5^(th) term? c) Find its 14^(th) term. d). Find the sum of 5^(th) to 14^(th) terms.

The sum of first 9 terms of an arithmetic sequence is 45 and the sum of first 18 terms is 171. What is the sum of its 10^(th) to 18^(th) terms?