What is the average of first 20 multiples of 7 ? Choose the correct choice from the following options.
A) A)70	B) B)77	C) C)79	D) D)84	E) E)82
Required average = 7(1+2+....+20) / 20   (8/20)X ( (20x21) / 2 ) (because sum of first 21 natural numbers)   = 84   84
<result>D</result>
What is the average of first 20 multiples of 7 ?