1.

3 के प्रथम नो गुडजो का औसत ज्ञात करे ?A. 21B. 12C. 15D. 18

Answer» Correct Answer - C
According to question
=3,6,9,12,15,….
Sum of numbers,
`Sn=n/2(2a+(n-1)d)`
`Sn=9/2 (2 xx 3 +(9-1)3)`
`Sn=9/2 (6+24)`
`Sn=9/2 xx 30 =135`
`therefore` Required average `=135/9`


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