0.24 The first two terms of an A.P are - 5 and 6. It's 21st term is Multiple Choice 1 Marks
1. 115
2. 115
3. - 215
4. 215
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a1=-5
a2=6
d=a2-a1
=6-(-5)
=11
an=a+(n-1) d
a21=(-5)+(20) *11
=-5+220
=115
hence answer is 115
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