Explanation:
Given
n = 5
1. 9n - 9
= 9 * 5 - 9
= 45 - 9
= 36
2 . (3n + 5n) 10
= ( 3 * 5 + 5* 5)10
= 40* 10
= 400
3 . 12 * n/2
= 12 * 5 / 2
= 6 * 5
= 30
Hope it will help :)
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