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find The sum all the 11th term of an AP whose midel term is 30

Posted by Amit Jaiswal 5 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 4 months ago

given n =11

middle term = (a1 + a11)/2 = 30

a1 + a11 = 60 .......... i

Sn = n/2(a1 + a11) ......... ii

= 11/2 (60) ... from i

= 11 x 30

= 330

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