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Four no. are in AP . If their sum is 20 ...

Four no. are in AP . If their sum is 20 and the sum of their squares is 120, then the middle terms are

A

2,4

B

4,6

C

6,8

D

8,10

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PATHFINDER-PROGRESSION AND SERIES -QUESTION BANK
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  9. If a,b,c are in AP and a^2,b^2,c^2 are in HP, then

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  10. If between 1 and 1/31 there are n H.M's and ratio of 7th and (n-1)^th ...

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  13. The value of x for which 1/(1+sqrtx),1/(1-x),1/(1-sqrtx) are in AP li...

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  14. If the non-zero numbers a,b,c are in AP and tan^-1a,tan^-1b,tan^-1c ar...

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  15. If a,b,c,d are distinct positive numbers in AP, then

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  16. If sum(r=1)^nr(r+1)(2r+3)=an^4+bn^3+cn^2+dn+e, then

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