Math, asked by mittals4478, 10 months ago

The first term of an A.P -3 and the 10th term is 15 find the Sn

Answers

Answered by abdulR786

1

Answer:

a10=a+9d

15=-3 +9d

d=2

Sn=n/2(2a+(n-1)d

Sn=n/2(-6+2n -2)

Sn=n² - 4n

Previous Question

Next Question

Similar questions

Science, 5 months ago

Leave come out at the______...

Math, 5 months ago

5 17 29 25 30 32 35 Section 1 of 3 Aptitude 5 37 39 Revisit Choose the best option Question # 39 O $65,000 A sum of money was invested for 3 years at the rate of 4% per annum compounded annually amounted to $84,364.80. What is the sum invested? O $70,000 0 $75,000 O $80,000 8-03040 1)...

Biology, 5 months ago

Fill in the blanks with suitable words: (i) (1) ____________ in → (2) ____________...

Math, 10 months ago

A solid cuboid of dimensions 30 into 25 into 9 is melted and cast to two identical cubes find the length of the cubes formed...

Biology, 10 months ago

Describe in short the function of heart?

Economy, 1 year ago

Explain the meaning of Investment Multiplier. What can be its minimum and maximum value?

Math, 1 year ago

15(m-4)-2(m-9)+5(m+6)=0...

Accountancy, 1 year ago

paymemt made during the year for sports material is to be added while preparing income and expenditure account?