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  1. The average of first nine multiples of 3 is ?
    1. 12.0
    2. 12.5
    3. 15.0
    4. 18.5
Correct Option: C

Average = ( 3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27 ) / 9
= 3(1+2+3+4+5+6+7+8+9)/9
= ( 45 / 3 )
= 15


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