7 6 12
5 5 7
4 6 ?
168 90 168
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Given :
7 6 12
5 5 7
4 6 ?
168 90 168
To find : ?
Solution:
7 6 12
5 5 7
4 6 ?
168 90 168
7 5 4 168
7 * ( 5 + 1) * 4 / 1 = 7 * 6 * 4 = 168
6 5 6 90
6 * (5 + 0) * 6 / 2 = 6 * 5 * 3 = 90
12 7 ? 168
? =x
12 * (7 - 1) * x / 3 = 168
=> 4 * 6 * x = 168
=> x = 7
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