Math

Question 1

What are permutations?

Answer 1

All the different combinations possible in any order.

The number of permutations of n objects taken r at a time is determined by the following formula:

P(n,r) = n! / (n−r)!

Question 2

What are combinations?

Answer 2

All the different combinations possible while preserving order.

C(n,r) = n! / (n-r)!r!

Question 3

Formula for Euclidean distance

Answer 3

e., √(x1 - x2)2 + (y1 - y2)2

Question 4

Formula for the sum of a series

Answer 4

Sn = n/2[2a + (n − 1)d]

n = the number of terms to be added
a = the first term in the sequence
d = the constant value between terms