2. The nth term of an arithmetic series is un where un >0 for all n The sum to n terms of the series is Sm
Given that u4 = 6 and that S11 = (u6)2 + 18
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Find the value of u20

If rt is greater than ba, which statement must be true ?

Is by a(-4, 2), b(-2, 4), c(1, 3), d(2, 2).of ofto . of d′ if90° to a′b′c′d′ (-2, 2) of c″ if90° to a″b″c″d″ (4, -2) of a′′′ if° to a′′′b′′′c′′′d′′′ (3, -1) of b″ if° to a″b″c″d″ (4, 2)

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