Math, asked by tarushia5104, 8 months ago

Find the sum of the following AP's (i) 5,7,9,11,...to 18terms

Answers

Answered by sandeepfaujdar
6

a=5 ,d=2 ,n=18

18th term = a+17d = 5+17(2)

i.e. 18th term or last term is 39

now,

sum of terms = n/2(first term + last term)

i.e. 18/2(5+39)

9(44)= 396

answer is 396

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