Consider the following pattern.
2³-1³= 1 + 2x1 x3
3³-2³ = 1 + 3 x 2 x 3
4³-3³ = 1 + 4 x3 x3
Using the above pattern, find the value of the following.
(1) 7³-6³ (ii) 12³ - 11³ (ii) 20³-19³
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13
Answer:
(i)7³-6³= 1 + 7*6*3
(ii) 12³-11³= 1 + 12*11*3
(iii) 20³-19³= 1 + 20*19*3
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