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Asked by Venkatesh

Nov 13, 2013

The ratio of the sum of n terms of two A.P.s is (7n+1):(4n+27).Find the ratio of their mth term.

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Asked by Lavanya N

Nov 24, 2013

If mth term of an A.P is 1/n and the nth term is 1/m show that the sum of mn term is 1/2(mn+1)

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Asked by Ishita Gupta

Feb 27, 2015

In an ap of 50 terms, the sum of 1st 10 terms is 210 and the sum of its last 15 terms is 2565. find the a.p.

Answer.

Consider a and d as the first term and the common difference of an A.P. respectively.

Asked by David

Feb 19, 2015

If m times the m^{th }term^{ }of an AP is equal to n times its n^{th} term, find (m+n)^{th} term.

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Asked by D narayana

Mar 14, 2015

The sum of first n terms of an AP is 3n^{2}+4n find the 25th term of this AP.

Given S

Asked by Manish B

Nov 21, 2014

How many three digit numbers are divisible by 7?

Sol:

The first three digit number which is divisible by 7 is 105 and last three digit number which is divisible by 7 is 994.

This is an A.P. in which

Asked by Saumya

Mar 11, 2014

If pth term of an A.P is 1/q and its qth term is 1/p then show that its (pq)th terms is ---- 1/2 (pq + 1)..........

Answer.

Given pth term = 1/q

That is a_{p} = a + (p - 1)d = 1/q

aq + (pq - q)d = 1 --- (1)

S...

Given pth term = 1/q

That is a

aq + (pq - q)d = 1 --- (1)

S...

Asked by Ishita Gupta

Feb 11, 2015

If the sum of 3 numbers in a.p. is 12 and the sum of their cubes is 288. find the numbers.

Consider the numbers are a , a+d , a+2d<...

Asked by David

Feb 19, 2015

The angles of a triangle are in AP. If the greatest angle is twice the least, find all the angles.

Let a-d,a,a+d. a-d+a+a+d=180 3a=180 a=60 Given that a+d =2(a-d) 60+d=(120-2d) 3d=60 d=20

Asked by Ajay

Oct 23, 2013

If m times the n ^{t}^{h }term of an A.P. is equal to n times its n^{th} term. Then show that m+n^{th} term of A.P. is 0.

Answer.