Question

1 + 2 + 3 + 4 + 5 + 6 of 8​

Answer 1

a=1

d=1

n=8

Sn= n/2(2a+(n-1)) d

= 8/2(2×1+(8-1))1

= 4(2+7)

= 4(9)

= 36

Answer 2

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$\bf{(i)} \: { \red{1 + 2 + 3 + 4 + 5 + 6\: of \: 8}} \\ = \bf{1 + 2 + 3 + 4 + 5 + 6 \times 8} \\ = \bf{1 + 2 + 3 + 4 + 5 + 48} \\ \\ \tt{ \blue{[According \: to \: B.O.D.M.A.S. \: rule]}} \\ \\ = \bf \boxed{ \mathfrak{63}}$