Question

In an Ap. 1,7,13,19...415 is an ap. Prove that, sum of middle terms is equal to the sum of first and last terms

Answer 1

Answer:

Step-by-step explanation:

a,a+d,a+2d...........{first three terms of an ap}

a+a+2d/2=2a+2d/2=a+d{second term}

similarly,

13+1/2=14/2=7