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If the first term of an A.P. is 2 and...

If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 terms is (a) 3200       (b) 1600        (c) 200         (d) 2800

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  8. The common difference of an A.P., the sum of whose n terms is Sn , i...

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  12. The sum of first n odd natural numbers is 2n-1 (b) 2n+1 (c) n^2 ...

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  13. Two A.P.’s have the same common difference. The first term of one o...

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  14. If 18 ,\ a ,\ b ,\ -3 are in A.P., the a+b= (a) 19 (b) 7 (c) 11 (d...

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  15. If (5+9+13+\ ddotto\ n\ t e r m s)/(7+9+11+\ ddotto\ (n+1)t e r m s)=(...

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  19. The sum of first 20 odd natural numbers is (a) 100       (b) 210  ...

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