# @mani0303

##### Manikandan Natarajan 3,610 karma I won't run on Sunday even if it's 100m event in Olympic games
pankaj verma @INPeace
An A.P has 2k(k is natural) terms. The sum of first, third, upto 2k-1 terms is 186 and sum of other terms is 216.If last term is 55 more than the first term, find the FOURTH term.
Manikandan Natarajan @mani0303

(n/2)*d = (216 - 186) and (n-1)d = 55...now we know n and d

pankaj verma @INPeace
In how many ways four digit no. can be formed such that 2 and 8 come together without repeatation...OA-dnk
Manikandan Natarajan @mani0303

I think that isn't necessary to multiply by 2 because while we selecting the number,the order would have been taken care of, @happy3475

pankaj verma @INPeace
In how many ways four digit no. can be formed such that 2 and 8 come together without repeatation...OA-dnk
pankaj verma @INPeace
If 12 balls are selected at random from box containing at infinite no. of white , red and black balls. Find the probality that such set contains exactly 6 white balls. (OA-if 1/13) plz explain approach...
Manikandan Natarajan @mani0303

If you take 12 balls,it must contain 0,or 1 or 12 white balls,but what we need is exactly 6 of them which would be one among the 13 possibilities..so 1/13

Harsha Malkar @hmkm
7\. There is a square field of side 500 m long each. It has a compound wall along its perimeter. At one of its corners, a triangular area of the field is to be cordoned off by erecting a straight-line fence. The compound wall and the fence will form its borders. If the length of the fence is 10...
Manikandan Natarajan @mani0303

that's specific type..you can't generalize for all isosceles triangle @hmkm

Harsha Malkar @hmkm
7\. There is a square field of side 500 m long each. It has a compound wall along its perimeter. At one of its corners, a triangular area of the field is to be cordoned off by erecting a straight-line fence. The compound wall and the fence will form its borders. If the length of the fence is 10...
Manikandan Natarajan @mani0303

Maximum area possible if the triangle is 90-45-45 type..so the hyp of that triangle is given,then area of that triangle is (1/2)*(100/_/2)*(100/_/2)

Asfakul Islam @Asfakul
*Find the number of quadratic polynomials ax2 + bx + c such that: a) a, b, c are distinct. b) a, b, c E {1, 2, 3, ...2008} c) x + 1 divides ax2 + bx + c* *a) 2013018 b) 2013021 c) 2014024 d) 2018040*
Manikandan Natarajan @mani0303

should be 2013021

@rainbow54
An equilateral triangle circumscribes three circles of radius 1 cm.....what is the perimeter of the equilateral triangle ?? Options 1) 6 ( Root 3 + 1) cm 2) Root3 (8 + root 2) cm 3) 15 ( root 3 - 1 ) cm
Manikandan Natarajan @mani0303
@rainbow54 Connect the centers of any two circles and each of the centers to the vertice close to it..Now find the longer of the parallel sides in the trapezium
@rainbow54
An equilateral triangle circumscribes three circles of radius 1 cm.....what is the perimeter of the equilateral triangle ?? Options 1) 6 ( Root 3 + 1) cm 2) Root3 (8 + root 2) cm 3) 15 ( root 3 - 1 ) cm