What will

What will be the average of the numbers from 1 to 51?

Correct answer:

a =  26

Step-by-step explanation:

AP: a1=1 d=1  a51=a1+(511) d=1+(511) 1=51  n=511=50  s=2a1+a51 n=21+51 50=1300  a=ns=501300=26

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