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

Verified by Experts

The correct Answer is:

A

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Knowledge Check

If 10^(th) and 4^(th) terms of a G.P are 9 and 4 respectively, then its 7^(th) term is…….

A

6

B

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If first term, second term and last term of an A.P are a,b and 2a respectively then there sum is……

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The p^(th), q^(th) and r^(th) terms of an A.P. are in geometric progression then common ratio for G.P is…….

A

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B

`(q-r)/(p-q)`

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pqr

D

None of these

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