Math, asked by airtelbhartibittu, 3 months ago

find the sum of first 20 terms 20 terms of an AP
9 , 17 , 25 ----------

Answers

Answered by nilavrochakraborty94

0

Step-by-step explanation:

First term (a)=9

Common difference (d)= 17-9

=>8

Therefore, S20 =n/2[2a+(n-1)d]

S20 = 20/2[2*9+(20-1)8]

S20 = 10[18+(19)8]

S20 = 10[18+152]

S20 = 10*170

S20 = 1700

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