d)
= 1 * 2 = 2
= 1 * 4 = 4
= 2 * 4 = 8
= 2 + 2 + 2
= 2*2 + 2*4 + 2*8
= 4 + 8 + 16
= 28
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d)
= 1 * 2 = 2
= 1 * 4 = 4
= 2 * 4 = 8
= 2 + 2 + 2
= 2*2 + 2*4 + 2*8
= 4 + 8 + 16
= 28