Math, asked by anjuindehri, 7 months ago

find the sum 7+101/2+14+....84

Answers

Answered by gphoolchand1

0

Answer:

........................311/2

Answered by rudronilroy

3

7+101/2 +14...84

here a = 7

d=101/2-7=21/2-7=21-14/2=7/2

Last term "l"=84

an = a +(n-1)d

here an = l = 84

84=7+(n-1)7/2

84-7=(n-1)7/2

77*2/7=n-1

22+1=n

therefore n= 23

s=n/2(a+l)

s=23/2(7+84)

s=23/2*91

s=2093/2

s=1046.5

Previous Question

Next Question

Similar questions

Science, 3 months ago

means of DNA and RNA...

Math, 3 months ago

The class intervals in a frequency distribution table is 44 - 48, 49 - 53, 54 - 58 with corresponding frequencies as 4, 5 and 7 respectively. The width of the second class interval is ______.

Biology, 3 months ago

What is ozone? Show the reactions of formation of ozone from oxygen in the atmosphere.

Math, 7 months ago

In a calendar a square of 9 numbers is marked. The sum of the numbers is 153. What are the numbers?

Science, 7 months ago

why water is so presious for world...

Science, 11 months ago

state any three advantages of synthetic fibers...

Physics, 11 months ago

Two trains A and B move on two parallel tracks with a speed of 40 km/hr and 140 km/hr in the opposite direction Please give mathematical answer...

Social Sciences, 11 months ago

on an outline map of India Mark the places where bauxite mica iron Copper and gold is found...