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| 1. |
a31= ?, a11 =38, a16 =73 find a31? |
| Answer» a11 = a + 10d = 38 ......... ia16 = a + 15d=73 ....... iifrom i and ii38 - 10d + 15d = 735d=35d = 7from ia + 70 = 38a = - 32a31=a +30d = -32 + 210 = 178a31 = 178 | |