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| 1. |
a+(a+d) +(a+2d) + ...... +(a+(n-1)d)= 1/2 n× {2a+(n-1)d}, n belongs to N |
| Answer» a+(a+d) +(a+2d) + ...... +(a+(n-1)d)= 1/2 n× {2a+(n-1)d}, n belongs to N | |