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  3. In a1, a2, a3 ........... an and b1, b2, b3 ......... bn are two A.P.’s such that a1b1 = 120, a2b2 = 143, a3b3 = 154 the a8b8

. In a1, a2, a3 ........... an and b1, b2, b3 ......... bn are two A.P.’s such that a1b1 = 120, a2b2 = 143, a3b3 = 154 the a8b8

1. 209

2. 89

3. 195

4. 29

Best Answer

ANS: 4

Sol: a1b1 = 120 = 15 × 18

a2b2 = 143 = 11 × 13

a3b3 = 154 = 14 × 11

a8 = 29, b8 = 1

a8b8 = 29

 

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