^{2}then (i) find first term and sum of first two terms. (Ans. 1400)

^{rd}and 4

^{th }term is 14. (Ans. 4/4, 65/12)

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

_{20 }and S

_{10.}1/6, 1/4, 1/3, ……

^{st}and 3

^{rd}term is – 30.

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MAHARASHTRA STD.XII HSC STD. XI FYJC STD. X SSC 5TH 6TH 7TH 8TH 9TH BOARD SOLUTIONS: 2019 2020 New Time table

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TAMIL-NADU: 8TH 9TH 10TH 11TH 12THOMTEX 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)

5. Find four consecutive terms in an A.P. whose sum is – 54 and the sum of 1^{st} and 3^{rd} term is – 30. (Ans.-3, 0, 3, 6, 9)

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