Math, asked by Sanaullah663, 11 months ago

How many terms of the ap 20 19 18 should be taken so that their sum is 300?

Answers

Answered by apm43

0

Answer:

Given : a =20

d=-1

Sn=300

Too find : n=?

Step-by-step explanation:

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

300 = n/2[2*20+(n-1)(-1)]

300*2/n=40-n+1

600/n =41-n

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