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Nov 13, 2013



Nov 24, 2013



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.



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

Feb 19, 2015



Mar 14, 2015



Given S

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

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)..........



Given pth term = 1/q
That is ap = a + (p - 1)d = 1/q
aq + (pq - q)d = 1  --- (1)
S...

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<...

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