Answer:
900 coins
Step-by-step explanation:
The Wiseman demands 1 gold coin for the 1st day, then 3 gold coins for the 2nd day, then 5 gold coins for the 3rd day and it continues for 30 days in this pattern.
Therefore, the total number of gold coins that he gets will be,
1+ 3+ 5+ ..... up to 30 terms.
This is an A.P. series with the first term(a) 1 and a common difference(d) 2 and the number of terms(n) 30.
Hence, the sum of the A.P. series is given by
=
= 900 coins (Answer)
Answer:
(B) 18.
Step-by-step explanation:
We are asked to find the perimeter of a quadrilateral with vertices at (-1, 4), (7,4), (7,5), and (-1. 5).
First of all, we will draw vertices of quadrilateral on coordinate plane and connect the vertices as shown in the attached photo.
We can see that our quadrilateral is a parallelogram, whose parallel sides are equal.
Therefore, the perimeter of the given quadrilateral is 18 units.
The number of ways of choosing 4 digits from 10 digits without replacement ( order is important) is . This is the number of all possible permutations of choosing 4 from 10. The first 4 numbers of your phone number is a unique 4 digit number(4 different digits). The required probability is