Look at these pictures: If the pattern is continued, do the numbers of coloured squares form an arithmetic sequence? Give reasons.

See the pictures below: How many large squares? Continuing this pattern, is each such sequence of numbers, an arithmetic sequence?

Sum of the algebraic form of an arithmetic sequence is 4n^(2)+5n . Write the sequence.

The algebraic form of an arithmetic sequence is 5n+5 What is its first term?

In an A.P., the first term is 3 and the last term is 17. The sum of all the terms in the sequence is 70. Then the number of terms in the arithmetic sequence is

See the pictures below: How many squares in all? Continuing this pattern, is each such sequence of numbers, an arithmetic sequence?

Write the whole numbers in 'the arithmetic sequence 11/8, 14/8, 17/8,….. Do they form an arithmetic sequence?

Prove that in any square pyramid, the squares of the height, slant height and lateral edge are in arithmetic sequence.

See the pictures below: How many small squares are there in each rectangle? Continuing this pattern, is each such sequence of numbers, an arithmetic sequence?

Observe the number pattern made using terms of an arithmetic sequence 2, 6,10, ... . Write the next two lines.

What is sum of the first.20 natural numbers? ii) The algebraic form of an arithmetic sequence is 6n+5. Find the sum of the first 20 terms of this sequence.