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| 1. |
Which term of A. P 21,42,63 ------ is 120 |
| Answer» Tn = a +(n-1)d120 = 21+ (n-1)21 120 -21 = (n-1)2199÷21 = (n-1)4.7 =(n-1)5 = n-1n = 5+1n = 6 | |