Question

Find the sum of all 11th term in AP whose middle most term is 30​

Answer 1

Answer:

330 is the sum of 11 terms

we have given A.P consists 11 terma

n+1/2=middle term

11+1/2=6

6th term is middle most term.

an=a+(n-1)d

30=a+(6-1)d

30=a+5d eq 1 a=30-5d

sum of 11 terms

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

sn=11/2 (2a+10d)

sn=11(a+5d)

sn=11 (30-5d+5d)

sn=11 (30)

sn =330

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