Mathematics Tes...

The probability that A speaks truth is4/5, while this probability for B is3/4. The probability that they contradict each other when asked to speak on a fact is

The minimum number of elements that must be added to the relation R= {(1,2)(2,3)} on the set of natural numbers so that it is an equivalence is

If the circles x² + y² = 9 and x² + y² − 2αx + 2y + 1 = 0 touch each other internally, then α=

If one root of the equation ax² + bx + c = 0 be n times the other root, then

If n(A) + n(B) = m, then the number of possible bijections from A to B is

If the$7^{th}$term of a harmonic progression is 8 and the$8^{th}$term is 7, then its${15}^{th}$term is

Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is

In a town of 10,000 families it was found that 40% family buy newspaper A, 20% buy newspaper B and 10% families buy newspaper C, 5% families buy A and B, 3% buy B and C and 4% buy A and C. If 2% families buy all the three newspapers, then number of families which buy A only is