Question

find out average of first 50 natural numbers

Answer 1

so we will do it like this

(1+2+3+4+5..........+50)/50

=1275/50
=25.5

average is 25.5


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Answer 2

${sn} = \frac{n}{2} \times( 2a + (n - 1)) \times d$
S50=25+49×1
=25+49
=74