3) find the sum of first 30 natural number
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Answer:
The sum of the first 30 natural number is 465.
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465
formula :n(n+1)/2
=30(30+1)/2
=30*31/2
30 will be cancelled by 2 . So 30 is now 15.
=15*31=465
15
× 31
15
45
465
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