Question

the sum offirst three terms of an ap is 6 and that of last three is 16.if the ap has 13 terms,what is the sum of middle three terms.​

Answer 1

Answer:

11

Step-by-step explanation:

let a1,a2,a3,...............a11, a12,a13 be the terms of

AP

sum of middle p terms

= 1/2( sum of first p+ sum of last p) terms

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