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Let a(1), a(2) ......, a(30) be an A.P.,...

Let `a_(1), a_(2) ......, a_(30)` be an A.P., `S = sum_(i=1)^(30) a_(i) and T = sum_(i=1)^(15) a_((2i -1))`. If `a_(5) = 27 and S - 2T = 75`, then `a_(10)` is equal to

A

57

B

47

C

42

D

52

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The correct Answer is:
D
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ALLEN-SEQUENCE AND PROGRESSION-Exercise (JM)
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  3. If, for a positive integer n , the quadratic equation, x(x+1)+(x-1)(x+...

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  4. For any three positive real numbers a, b and c, 9(25a^2+b^2)+25(c^2-3a...

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  5. Let a, b, c in R. If f (x) = ax^(2) + bx + c is such that a + b + c = ...

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  8. If a, b and c be three distinct real number in G.P. and a + b + c = xb...

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  9. Let a(1), a(2) ......, a(30) be an A.P., S = sum(i=1)^(30) a(i) and T...

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  10. Find sun of first 15 term of series 1+6+(9(1^2+2^2+3^2))/(7)+(12(1^2+...

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  11. If x and y are positive real numbers and m, n are any positive integ...

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  12. If sin^4 alpha + 4 cos^4 beta + 2 = 4sqrt2 sin alpha cos beta ; alpha,...

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  13. The sum of all natural number 'n' such that 100 lt n lt 200 and H.C.F....

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  14. If a ,b ,a n dc are in G.P., then the equations a x^2+2b x+c=0a n ddx^...

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  15. Let the sum of the first n terms of a non-constant A.P., a(1), a(2), a...

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  16. The sum (3 xx 1^(3))/(1^(2)) + (5 xx (1^(3) + 2^(3)))/(1^(2) + 2^(2)) ...

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  17. Let numbers a(1),a(2)…a(16) are in AP and a(1)+a(4)+a(7)+a(10)+a(13)+a...

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  18. Let a,b and c be in G.P. with common ratio r, where a != 0 and 0 lt r ...

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  19. If alpha and beta are the roots of the equation 375 x^(2) - 25x - 2 = ...

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  20. If alpha, beta and gamma are three consecutive terms of a non-constant...

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