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If a 1 , a 2 , a 3 , , a 2 n + 1 are i...

If `a 1` , a 2 , a 3 , , a 2 n + 1 are in A.P., then a 2 n + 1 − a 1 a 2 n + 1 + a 1 + a 2 n − a 2 a 2 n + a 2 + + a n + 2 − a n a n + 2 + a n is equal to a. n ( n + 1 ) 2 × a 2 − a 1 a n + 1 b. n ( n + 1 ) 2 c. ( n + 1 ) ( a 2 − a 1 ) d. none of these

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CENGAGE ENGLISH-SEQUENCES AND SERIES-All Questions
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  14. In triangle ABC medians AD and CE are drawn, if AD=5, angleDAC= pi/8 a...

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  15. Suppose a ,b, and c are in A.P. and a^2, b^2 and c^2 are in G.P. If...

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  18. If a ,b ,a n dc are in H.P., then th value of ((a c+a b-b c)(a b+b c-a...

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  19. If a1, a2, a3, an are in H.P. and f(k)=(sum(r=1)^n ar)-ak ,t h e n (a...

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