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If 3^(rd) and 10^(th) terms of an A.P. b...

If `3^(rd) and 10^(th)` terms of an A.P. be 9 and 21 respectively. Then the sum of its first 12 terms is…….

A

180

B

360

C

150

D

210

Text Solution

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The correct Answer is:
A
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KUMAR PRAKASHAN-SEQUENCE AND SERIES-Textbook based MCQs
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  2. The A.M. of two positive number is 2. If 1 is added in large number th...

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  3. (1)/(2 xx 5) + (1)/(5 xx 8) + (1)/(8 xx 11)+ …..100 terms= ……

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  4. If a,b,c are in HP, then prove that (a+b)/(2a-b)+(c+b)/(2c-b)gt4.

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  5. Fill in the blanks so as to make each of the following statements true...

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  6. If first term, second term and last term of an A.P are a,b and 2a resp...

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  7. If a(1), a(2), a(3).,,,,,,,,a(n) are in A.P and their common differenc...

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  8. The sum of first n even natural numbers is k times the sum of first n ...

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  9. The sum of …….terms of on A.P. 3, 7, 11, 15,….. Will becomes 406

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  10. S(n) denots the sum of first n terms of an A.P. Its first term is a an...

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  11. If a, b, c are in G.P. and a^(1/x) =b^(1/y)=c^(1/z) , prove that x, y...

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  12. The p^(th), q^(th) and r^(th) terms of an A.P. are in geometric progre...

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  13. If a,b,c are in G.P and A.M of a and b is x and A.M. of b and c is y t...

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  14. If 10^(th) and 4^(th) terms of a G.P are 9 and 4 respectively, then it...

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  15. If A be one A.M and p, q be two G.M.'s between two numbers then 2A is ...

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  17. The A.M of two positive number is x and two G.M.'s between them are y ...

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  18. Series (1)/(log(2)^(2)) + (1)/(log(4)^(4)) + (1)/(log(8)^(4)) + …..+ (...

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  19. If Sigma n = 210 " then " Sigma n^(2)=…….

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