Find the Arithmetic mean of series of all such two-digit numbers which are divisible by 7.
Explanation:
2-digit numbers which are divisible by 7 are: 14, 21, 28. …, 98.
We know the Arithmetic mean of an A.P. is same as the average of first and last term.
⇒ AM = (14 + 98)/2 = 56.
Hence, 56.
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