what is the average of all the number between 8 and 74 which are divisible by 7
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Sum of n terms is n/2(2a+(n-1)d) .............(formula) n is number of terms a is first term d is difference between first two cosecutive numbers numbers between 8 to 74 which is divisible by 7 is 7 table sequence is 14 21 28 35 42 49 56 63 70.
Now apply formula n is 9 terms a is 14 and d is 7. Sum of terms is 9/2(2(14)+(8)7) =4.5(84) =378 average is 378/9 =42
Now apply formula n is 9 terms a is 14 and d is 7. Sum of terms is 9/2(2(14)+(8)7) =4.5(84) =378 average is 378/9 =42
vishal3688:
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Hey see the answer in pic...
Hope it helps...
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Hope it helps...
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