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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