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**i) 3!+1+3+13+7=30 [ If we solve by factorial method]**

**ii) 3!+3!+3!+3!+3!=30**

**[3!=3×2×1=6]**

**[without factorial method]**

**Odd nos added for odd nos. of time will always give an ODD NUMBER.**

**Odd nos added for even no of time will give an EVEN NUMBER.**

(15 – 9) + (13 – 7) + (7 – 1) + (9 – 1) + (13 – 9)If you calculate it, you will get

6 + 6 + 6 + 8 + 4 = 30