OMTEX
CLASSES

“THE
HOME OF SUCCESS”

1.
Find the sum of first 11 positive numbers which
are multiples of 6. (Ans. 54.)

2.
From an A.P. first and last term is 13 and 216
respectively. Common difference is 7. How many terms are there in that A.P.
Find the sums of all terms? (Ans. 40)

3.
The sum of first n terms of an A.P. is 3n+n^{2}
then (i) find first term and sum of first two terms. (Ans. 1400)

4.
Find four consecutive terms in an A.P.
whose sum is 12 and the sum of 3^{rd} and 4^{th }term is 14. (Ans. 4/4, 65/12)

5.
In winter, the temperature at a hill
station from Monday to Friday is in A.P. The sum of the temperatures of Monday,
Tuesday and Wednesday is zero and the sum of the temperatures of Thursday and
Friday is 15. Find the temperature of each of the five days. (Ans. -18, -15, -12, -9)

OMTEX
CLASSES

“THE
HOME OF SUCCESS”

1.
Find t_{11} from the following A.P. 4,
9, 14, … (Ans. 396)

2.
In the A.P. 7, 14, 21 … How many terms are to be
considered for getting sum 5740.(Ans. 30, 3435)

3.
Second and fourth term of an A.P. is 12 and 20
respectively. Find the sum of first 25 terms of that A.P. (Ans. 4, 10)

4.
For an A.P. given below find t_{20 }
and S_{10.} 1/6, 1/4, 1/3, …… (Ans.-3 , 1, 5, 9)