If are in an A.P. and , are also in an A.P., then is equal to...

(b) : We have, are in an A.P. 2 _e b= _e a+ _e c b^2=a c \#(i), are in an A.P. 2( _e 2 b- _e 3 c)= _e a- _e 2 b+ _e 3 c- _e a 4 b^29 c^2=3 c2 b \#(i i) (i) and (ii), we have=9 c^24 c a=94 c a: b: c=94: 32: 1=9: 6: 4...

If \log_{e}a, \log_{e}b, \log_{e}c are in an A.P. and \log_{e}a - \log_{e}2b, \log_{e}2b - \log_{e}3c,\log_{e}3c - \log_{e}a are also in an A.P., then a:b:c is equal to: Sequence & Series (Mathematics)

\log_{e}a,\log_{e}b,\log_{e}c

are in an A.P. and\n

\log_{e}a - \log_{e}2b

,\n

\log_{e}2b - \log_{e}3c,\log_{e}3c - \log_{e}a

are also in an\n A.P., then

a:b:c

is equal to

The sum of the first n terms of the series (1^{2} + 2.2^{2} + 3^{2} + 2.4^{2} + 5^{2} + 2 . 6^{2} + ..) is (\frac{n(n + 1)^{2}}{2}, when n is even. when n is odd, the sum is

Let a,b be two non-zero real numbers. If p and r are the roots of the equation x^{2} - 8ax + 2a = 0 and q and s are the roots of the equation \end{enumerate} x^{2} + 12bx + 6b = 0, such that \frac{1}{p},\frac{1}{q},\frac{1}{r},\frac{1}{s} are in A.P., then a^{- 1} - b^{- 1} is equal to

Let A_{1},G_{1} and H_{1} denote the arithmetic, geometric and harmonic means . respectively of two distinct positive numbers. For n ? 2 let A_{n - 1} and H_{n - 1} have . arithmetic, geometric and harmonic means as A_{n},G_{n},H_{n} respectively. Which of the following statements is correct?

If a_{1},a_{2},a_{3}, are in A.P. such that a_{1} + a_{7} + a_{16} = 40, then the sum of the first 15 terms of this A.P. is

For any odd integer n ? 1,n^{3} - (n - 1)^{3} + + ( - 1)^{n - 1}1^{3} =

Number of 4 -digit numbers that are less than or equal to 2800 and either divisible by 3 or by 11 , is equal to

If a_{n} = \frac{3}{4} - ( \frac{3}{4} )^{2} + ( \frac{3}{4} )^{3} + ( - 1)^{n - 1}( \frac{3}{4} )^{n} and b_{n} = 1 - a_{n}, then find the least natural number n_{0} such that b_{n} > a_{n}\forall n ? n_{0}

If a_1, a_2, a_n are in A.P. where a_i>0 for all i show that &\frac{1}{\sqrt{a_1}+\sqrt{a_2}}+\frac{1}{\sqrt{a_2}+\sqrt{a_3}}+\cdots+\frac{1}{\sqrt{a_{n-1}}+\sqrt{a_n}}&=\frac{n-1}{\sqrt{a_1}+\sqrt{a_n}}

Different A.P. are constructed with the first term 100 , the last term 199, and integral common differences. The sum of the common differences of all such A.P. having at least 3 terms and at most 33 terms is

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