3. If 1 + 2 + 3 + ... + n = 28, then find the value of
1² + 22 + 32 + ... + n².
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Step-by-step explanation:
the answer is 254 by step by step first 1+2+3+4+n=28
n=12-28=16
1²+22+32+42+n² n²=156
98+156=254
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