Question

Holaa!!!
plz answer to above 14th question with explaination.​

Answer 1

Answer:

hope it helps

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Answer 2

Step-by-step explanation:

let d be the common difference

first term is a

last term is b

so a+(n+2-1)d= b

a +( n+1)d=b

d =b-a/(n+1)

now

Xn = a + (n+1-1)d

Xn = a +(n)b-a/n+1

Xn = { (n+1)a +(b-a )n}/n+1

Xn = (an + a +bn -an )/n+1

Xn = ( a +bn )/n+1

hence proved !