Find the sum of all the numbers in the first ten lines.

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

Consider the numbers between 100 and 300 which leave remainder 2 on division by 3 a) Which is the first number in this sequençe? b) Which is the last number in this sequence? c). How many such numbers are there in this sequence? d) Find the, sum of all numbers in the sequence.

Find the sum of all three digit numbers, which are multiples of 9 .

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.

Find the sum of all 3 digit numbers which are multiple of 5.

Find the smallest 3 digit number which is the multiple of 6. Find the sum of all the three digit numbers which are the multiple of six.

Find the sum of all three digit numbers which leave the remainder 1 when divided by 4 .

Suppose that a, ar, ar^2,ar^3,ar^4,ar^5 are the first 6 terms of a G.P Find the ratio of the sum of the first tree terms and the sum of first 6 terms

Two dice are rolled once. Let A be the event that the first die shows an odd number and B be the event that the sum of the numbers on the dice is 8. Find the probability that either the first die shows an odd number or the sum of numbers on the dice is 8.

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