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प्रश्न
The mean of first fifteen even numbers is ____________
विकल्प
4
16
5
10
उत्तर
16
Explanation;
Hint:
`(2 + 4 + 6 + .... + 30)/15 = (2[1 + 2 + 3 + .... 15])/15`
= `2 xx 120/15`
= 16
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