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= 3 + (60-1) 4
= 3 + 59 . 4
= 3 + 236
= 239
3. Un = - 3n
= - 3. 25
= 625 - 75
U25 = 550
5. = 2.3
= 6
U60=4.60-1
=239
2. a=5
b=5
Un=a+(n-1)b
Un=5+(n-1)5
Un=5+5n-5
Un=5n
3. U25=25²-3 x 25
=625-75
=550
4. 8,10,12
5. √180=√6x√6x√5
=√36x√5
=6√5
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