11. The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

1.   The sum of the three consecutive numbers of an A.P. is 21 and the sum of their squares is 165. Find these terms.

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10. Find the sum of 7 lying between 300 and 700.

 Find the sum of 7 lying between 300 and 700.

Find the sum of : (i) All odd natural numbers smaller than 50. (ii) First 12 natural numbers that are multiples of 7.

 Find the sum of :

(i)              All odd natural numbers smaller than 50.

(ii)           First 12 natural numbers that are multiples of 7.

Find the sum of the first 22 terms of the A.P. : 1, 3, -2, …………….

1.   Find the sum of the first 22 terms of the A.P. :

1, 3, -2, …………….

7. How many three digit numbers are divisible by 87?

   How many three digit numbers are divisible by 87?

6. Find the value of p, if x, 2x+p and 3x+6 are in A.P.

1.   Find the value of p, if x, 2x+p and 3x+6 are in A.P.

5. If the third term of an A.P. is 5 and the seventh term is 9, find the 17th term.

1.   If the third term of an A.P. is 5 and the seventh term is 9, find the 17^th term.