Question

The first term and the c.d of an AP are 13 and 5 respectively. Find the sum from the sixth term to the 20th term *



a) 576

b) 146

c) 1095

d) 1080

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Answer 1

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Answer 2

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formula for addition is (n/2)×(2a+(n-1)d)

here a is first term

d is common difference

n is no of terms

put n=20 and n=5

subtract both you will get answer as 1095