1.

What is the average of all numbers between 8 and 74 which are divisible by 7?1). 402). 413). 424). 43

Answer»

First number to be DIVISIBLE by 7 in this range = 14

Last number to be divisible by 7 in this range = 70

This is an AP with DIFFERENCE = 7

Let the total NUMBERS in this AP be n

⇒ Average = Sum of AP/total numbers

⇒ Average = [n/2(last term + first term)]/n

⇒ Average = (last term + first term)/2

∴ Average = (14 + 70)/2 = 42



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