Math, asked by mirzamaheen94, 7 months ago

Sec
564
Example 17 The sum of fourth and sixteenth term of an A.P. is 8. Find the sum of nineteen terms of this
(UP 2013)
A.P

Answers

Answered by Officialsakshi

0

Answer:

s40=3420. Explanation: We know that sn=n2(2a+(n−1)d). Thus. 186=122( 2a+(11)d). 186=6(2a+11d). 31=2a+11d.

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