Gonitzoggoβ
যোগ-গুণ ও গুণ-যোগ
$$A=1×2+3×.............+37×38+39$$
$$B=1+2×3+.......+36×37+38×39$$
What is the difference between $A$ and $B$?
Source: MAA
$$B=1+2×3+.......+36×37+38×39$$
What is the difference between $A$ and $B$?
Source: MAA
Algebra
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