Difference 81835

Determine the difference d in AP if a1=3 and a1+a2=12

Correct answer:

d =  6

Step-by-step explanation:

a1=3 a1+a2=12  a2 = a1 + d a1+a2=12  a1+a1+d=12  d=122 a1=122 3=6   Verifying Solution:  a2=a1+d=3+6=9 s=a1+a2=3+9=12

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