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Question
The value of (13 + 23 + 33 + ... + 153) – (1 + 2 + 3 + ... + 15) is
Options
14400
14200
14280
14520
Solution
14280
Explanation;
Hint:
`((15 xx 16)/2)^2 - (15 xx16)/2`
= (120)2 – 120
= 14280
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