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  1. If X * Y = X2 + Y2 – XY then 11 * 13 is
    1. 117
    2. 147
    3. 290
    4. 433
Correct Option: B

X ★ ★ Y = X2 + Y2 – XY
∴  11 ★ ★ 13 = 112 + 132 – 11 × 13
= 121 + 169 – 143 = 147


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