Question

How many terms of the A.P. -6, -11/2,-5,... are needed to give the sum -25

let f: X-Y be a function and let A, B are subsets of X. show that f(A Δ B) is a subset of f(A) Δ f(B)

consider the relation defined on the set X of all real valued functions f: R-R by f R g if and only if f-g is even function. determine wether the relation is an equivalence relation on X.

Find all zeros of the polynomial 3x^3 + 10x^2 – 9x – 4 if one of its zero is 1.

np4=840, find n (let n^2 - 3n=x

The number of clients that enter a given store each hour follows a Poisson distribution with mean 3.25. We assume independence between the different hours. The probability that in a given hour exactly 5 clients enter the store is?