Arithmetic Quizzes Online & Trivia

59=2+3(n-1) n=20

Ratio is 3 and 7th term is 162 i think so

The arithmetic mean formula is also sometimes just called the mean. One can arrive at the solution to this formula by adding together all the number in a set and dividing them by the number of items in the set. Essentially one can also look at the mean of a set of numbers as the average of that set of numbers. The mean serves to show what the median number is for all the numbers that will be listed in a set. This is one of the simpler mathematical operations that one can perform. An example of arithmetic mean in action would be 1+2+3=6/3=2. The arithmetic mean of the number set including 1,2, and 3 is 2.

Answer must be 60 First term is 12, Last term is 248 248 = 12 + (n-1)4 236 = (n-1)4 59 = n-1 n = 60

A= 121 d= -4 let the first negative term be an, s0 an<0 a+(n-1)d<0 121+(n-1)(-4)<0 121-4n+4<0 125-4n<0 so by hit and trial method, let n=30,so 125-4n =125-120=5,which is not less than0 again let n=31 so 125-4n=125-124=1 which is not less than 0 now,let n=32 so 125-4n=125-128= -3 hence the first negetive term is -3 now an= -3 a+(n-1)d= -3 121+(n-1)(-4)= -3 -4(n-1)= -3-121 -4(n-1)=-124 n-1=32 n=33 hence,answer is 33

How did you come up with 3 can you describe the formula

I would like to see the explicit formula written for this question

None.dont understand it

An=A1 + (n-1)d. A4= A1 + (4-1)d 93= A1 + (3) -7 93= A1 - 21 93 + 21=A1 114 = A1

23

72%At the end of two hours, the patient still has a 100% chance of survival. After three hours, he has an 85% of survival, or 0.85. After four hours, he has an 85% and of the 85% he had at the end of three hours: 0.85 x 0.85 = 72.25% chance of survival.

5 hours