Accountancy, asked by snehakataria419, 17 days ago

An arithmetic progression has t1 = 7 , tn = 77 , and , Sn = 420 . Find n and d.

Answers

Answered by saifulaqib7602

1

Answer:

n=70

t=11/10 or 0.1

s=6

Explanation:

eq1 t1=7 eq2 TN=77

subtract TN from t1

TN =77

-

T1=7

-----------

n=70

put n=70 in eq1

t(70)=77

divide both side by 70

t=10/11

now put the value of n in Sn=420

s(70)=420

divide both side by 70

s70/70=420/70

s=6

Previous Question

Next Question

Similar questions

Physics, 8 days ago

Why in conductors charge is transferred by free electrons rather than by positive charges? Free electrons move from higher potential to lower potential while positive charges are fixed and vibrate at their mean position .

Physics, 8 days ago

24. You are given three mirrors of different types. How will you identify each one of them...

Math, 8 days ago

helpppppppppppppppp !!!!!!! With method ...

Environmental Sciences, 17 days ago

9. "While replacing the destroyed forest, the trees of same species should be planted.” Justify the statement.

Physics, 17 days ago

Kiran has purchased an electric bulb rated as 100 W and 250 V. She connected the bulb with a battery of 250 V and put the switch on for 50 s. (a) What is the resistance of the filament of the bulb? (b) Find the current drawn from the battery. (c) Calculate the energy dissipated from the bulb in 50 s.

Math, 9 months ago

10. Apples have to be packed in boxes containing either a dozen each or 50 each. What is the least number of apples needed so that packing can be done either way without leaving any apple outside the box?

Math, 9 months ago

8 percent of what number is 16...

English, 9 months ago

Character sketch of john,the son of bladwin...